WO2016098900A1 - 鞍乗型車両 - Google Patents

鞍乗型車両 Download PDF

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Publication number
WO2016098900A1
WO2016098900A1 PCT/JP2015/085570 JP2015085570W WO2016098900A1 WO 2016098900 A1 WO2016098900 A1 WO 2016098900A1 JP 2015085570 W JP2015085570 W JP 2015085570W WO 2016098900 A1 WO2016098900 A1 WO 2016098900A1
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WO
WIPO (PCT)
Prior art keywords
catalyst
cover
exhaust
viewed
exhaust passage
Prior art date
Application number
PCT/JP2015/085570
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
大輔 高須
信 小林
誠 脇村
雄二 奥
Original Assignee
ヤマハ発動機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ヤマハ発動機株式会社 filed Critical ヤマハ発動機株式会社
Priority to EP15870099.7A priority Critical patent/EP3235714B1/en
Priority to TW104143046A priority patent/TWI577600B/zh
Priority to TW104143042A priority patent/TWI612213B/zh
Priority to TW104143043A priority patent/TWI576506B/zh
Priority to TW104143044A priority patent/TWI637106B/zh
Priority to TW104143040A priority patent/TWI577883B/zh
Priority to TW104143041A priority patent/TWI644018B/zh
Priority to TW104143039A priority patent/TWI573930B/zh
Publication of WO2016098900A1 publication Critical patent/WO2016098900A1/ja

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M7/00—Motorcycles characterised by position of motor or engine
    • B62M7/02—Motorcycles characterised by position of motor or engine with engine between front and rear wheels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/002—Apparatus adapted for particular uses, e.g. for portable devices driven by machines or engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F01N13/0093—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are of the same type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F01N13/10—Other arrangements or adaptations of exhaust conduits of exhaust manifolds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/101—Three-way catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
    • F01N13/141—Double-walled exhaust pipes or housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
    • F01N13/141—Double-walled exhaust pipes or housings
    • F01N13/143—Double-walled exhaust pipes or housings with air filling the space between both walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/08—Exhaust treating devices having provisions not otherwise provided for for preventing heat loss or temperature drop, using other means than layers of heat-insulating material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/20—Exhaust treating devices having provisions not otherwise provided for for heat or sound protection, e.g. using a shield or specially shaped outer surface of exhaust device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
    • F01N2590/04—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for motorcycles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • F02B61/02—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving cycles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to a saddle riding type vehicle.
  • Patent Document 1 discloses a straddle-type vehicle having a structure in which a lower part of an engine unit is covered with a vehicle body cover.
  • the engine unit described in Patent Document 1 has a catalyst portion disposed below the engine body.
  • a catalyst for purifying exhaust gas is disposed inside the catalyst portion.
  • the parts arranged around the catalyst part are easily affected by the heat of the catalyst part.
  • the parts disposed around the catalyst part include a vehicle body cover. Therefore, a hole for exposing a part of the catalyst portion is formed in the vehicle body cover of Patent Document 1. Thereby, the thermal influence which a vehicle body cover receives is suppressed.
  • the present invention provides a straddle-type vehicle that can shorten the time until the catalyst is activated from the inactive state, and can suppress the thermal effect on the parts arranged around the catalyst portion and the deterioration of the catalyst. For the purpose.
  • An exhaust port for discharging exhaust gas is formed on the front surface of the engine body.
  • the inventor of the present application first considered arranging the catalyst portion in front of the engine body in order to shorten the path length from the combustion chamber to the catalyst portion. Thereby, higher temperature exhaust gas flows into the catalyst part. Therefore, the time until the catalyst is activated from the inactive state can be shortened.
  • the catalyst part when the catalyst part is disposed in front of the engine body, it is considered that the catalyst part directly receives the air flow during the traveling of the vehicle. By receiving the flow of air in the catalyst part, it is possible to prevent the temperature of the catalyst part from becoming too high.
  • the present inventor has considered to cover the catalyst portion with a vehicle body cover from the front in order to reduce the flow of air received by the catalyst portion arranged in front of the engine body.
  • the catalyst portion is covered with the vehicle body cover from the front, hot air is trapped between the engine body and the vehicle body cover when the vehicle is stopped. At this time, not only the catalyst part but also the engine body is hot. Therefore, it is considered that the temperature between the engine main body and the vehicle body cover becomes higher immediately after the traveling of the vehicle is stopped. For this reason, even if it is possible to prevent the catalyst from becoming inactive during traveling, the thermal effect on the parts arranged around the catalyst portion after traveling is further increased.
  • a straddle-type vehicle includes a vehicle body frame, an engine unit supported by the vehicle body frame, and at least one front wheel.
  • a front wheel portion having a length in the left-right direction smaller than a maximum length in the left-right direction of the engine unit, a vehicle body cover that covers at least a part of the vehicle body frame and is supported by the vehicle body frame, Is provided.
  • the engine unit is connected to an engine main body having at least one combustion chamber and a front portion of the engine main body, and exhaust gas discharged from the at least one combustion chamber flows and releases the exhaust gas to the atmosphere.
  • an exhaust device having an outlet.
  • the exhaust device has a main catalyst that most purifies the exhaust gas discharged from the at least one combustion chamber in at least one exhaust path from the at least one combustion chamber to the atmospheric discharge port, and the flow direction of the exhaust gas Is the same as the length of the main catalyst in the exhaust gas flow direction, and is disposed below the upper end of the front wheel portion in the vertical direction of the vehicle, and at least a part of the engine body is seen in the horizontal direction. And a catalyst part disposed between the front wheel part and an upstream exhaust passage part connecting the catalyst part and the engine body.
  • the vehicle body cover covers at least a part of the catalyst part when viewed from the left in the left-right direction, and at least a part of a front end is provided between the catalyst part and the front wheel part when viewed from the left in the left-right direction.
  • a left catalyst cover portion disposed, covering at least a part of the catalyst portion when viewed from the right in the left-right direction, and having a front end between the catalyst portion and the front wheel portion as viewed from the right in the left-right direction.
  • a right catalyst cover portion at least partially disposed.
  • the vehicle body cover is configured such that the maximum value of the lateral distance between the front end of the left catalyst cover portion and the front end of the right catalyst cover portion is smaller than the maximum length of the engine body in the left-right direction. It is formed.
  • the exhaust device and the vehicle body cover include the front end of the left catalyst cover portion and the front end of the right catalyst cover portion when the vehicle body cover, the engine body, and the exhaust device are viewed from the front in the front-rear direction. And more than half of the catalyst part is exposed.
  • the saddle riding type vehicle includes a vehicle body frame, an engine unit, a front wheel portion, and a vehicle body cover.
  • the left-right direction, the front-rear direction, and the up-down direction are the left-right direction of the vehicle, the front-rear direction of the vehicle, and the up-down direction of the vehicle, respectively.
  • the engine unit is supported by the body frame.
  • the front wheel portion includes at least one front wheel.
  • the front wheel portion is disposed in front of the engine unit when viewed in the left-right direction.
  • the vehicle body cover covers at least a part of the vehicle body frame.
  • the vehicle body cover is supported by the vehicle body frame.
  • the engine unit includes an engine body and an exhaust device.
  • the engine body has at least one combustion chamber.
  • the exhaust device is connected to the front part of the engine body. Exhaust gas discharged from at least one combustion chamber flows through the exhaust device.
  • the exhaust device has an atmospheric discharge port for discharging exhaust gas to the atmosphere.
  • the exhaust device has a catalyst part and an upstream exhaust passage part.
  • the catalyst part has a main catalyst.
  • the main catalyst most purifies the exhaust gas discharged from the at least one combustion chamber in at least one exhaust path from the at least one combustion chamber to the atmospheric discharge port.
  • the length of the catalyst part in the exhaust gas flow direction is the same as the length of the main catalyst in the exhaust gas flow direction.
  • the upstream exhaust passage portion connects the catalyst portion and the engine body.
  • the catalyst portion is disposed between the engine body and the front wheel portion when viewed in the left-right direction. Accordingly, the path length from the combustion chamber of the engine body to the catalyst portion is short. Therefore, higher temperature exhaust gas flows into the catalyst part. Therefore, when the engine unit is cold started, the time until the main catalyst is activated from the inactive state can be shortened.
  • the cold start of the engine unit means that the engine unit is started in a state where the temperature of the engine main body is at the outside air temperature or lower. Further, the length of the front wheel portion in the left-right direction is smaller than the maximum length of the engine unit in the left-right direction.
  • the front wheel portion is disposed in front of the engine unit when viewed in the left-right direction. While the vehicle is running, air flows backward from the front end of the front wheel part, spreading to the left and right of the front wheel part.
  • the inventor of the present application has come up with the idea of using this air flow in order to suppress the temperature drop of the catalyst part during traveling and the thermal effect on the components arranged around the catalyst part after traveling stop.
  • the left catalyst cover part of the vehicle body cover covers at least a part of the catalyst part when viewed from the left.
  • the right catalyst cover part of the vehicle body cover covers at least a part of the catalyst part when viewed from the right side. Thereby, it can suppress that a catalyst part receives the flow of air directly from the left-right direction during driving
  • at least a part of the front end of the left catalyst cover part is disposed between the catalyst part and the front wheel part as viewed from the left.
  • at least a part of the front end of the right catalyst cover portion is disposed between the front surface of the catalyst portion and the rear surface of the front wheel portion when viewed from the right side.
  • the distance D is the maximum value of the separation distance in the left-right direction between the front end of the left catalyst cover portion and the front end of the right catalyst cover portion.
  • the vehicle body cover is formed such that the separation distance D is smaller than the maximum length in the left-right direction of the engine body. That is, the distance in the left-right direction between the front end of the left catalyst cover portion and the front end of the right catalyst cover portion is relatively short.
  • the catalyst portion is disposed between the engine body and the front wheel portion when viewed in the left-right direction. Furthermore, the catalyst part is disposed below the upper end of the front wheel part. Therefore, it is possible to further suppress the catalyst part from directly receiving the air flow by the front wheel part while the vehicle is running.
  • working can be suppressed.
  • the vehicle body cover, the engine body, and the exhaust device are viewed from the front, more than half of the catalyst portion is exposed between the front end of the left catalyst cover portion and the front end of the right catalyst cover portion.
  • the catalyst unit can receive an appropriate amount of air while the vehicle is running. Therefore, it is possible to suppress the thermal influence on the parts arranged around the catalyst part and the deterioration of the main catalyst while suppressing the temperature drop of the catalyst part during traveling.
  • the exhaust device and the vehicle body cover are formed in this way, the heat of the catalyst part is easily radiated forward. Therefore, even when the vehicle is stopped, hot air is unlikely to stay around the catalyst unit. Therefore, it is possible to suppress the thermal influence on the parts arranged around the catalyst part after the stop of traveling. Therefore, even if the catalyst part is arranged in front of the engine body, it is possible to suppress the thermal influence on the parts arranged around the catalyst part after the traveling is stopped while suppressing the temperature drop of the catalyst part during traveling.
  • the saddle riding type vehicle according to the present invention can shorten the time until the catalyst unit is activated from the inactive state, and suppress the thermal influence on the components arranged around the catalyst unit and the deterioration of the main catalyst. it can.
  • the straddle-type vehicle of the present invention preferably has the following configuration.
  • the exhaust device and the vehicle body cover include the front end of the left catalyst cover portion and the left end of the front wheel portion when the vehicle body cover, the engine body, the exhaust device, and the front wheel portion are viewed from the front in the front-rear direction. Or between the front end of the right catalyst cover part and the right end of the front wheel part, at least a part of the catalyst part is exposed.
  • the vehicle body cover, the engine body, the exhaust device, and the front wheel portion when the vehicle body cover, the engine body, the exhaust device, and the front wheel portion are viewed from the front, at least a part of the catalyst portion is exposed between the front end of the left catalyst cover portion and the left end of the front wheel portion.
  • the vehicle body cover, the engine body, the exhaust device, and the front wheel portion are viewed from the front, at least a part of the catalyst portion is exposed between the front end of the right catalyst cover portion and the right end of the front wheel portion.
  • the straddle-type vehicle of the present invention preferably has the following configuration.
  • the center of the upstream end and the center of the downstream end of the catalyst portion are both located on the left or right side of the plane passing through the center in the left-right direction of the front wheel portion when viewed in the front-rear direction. Configured.
  • the center of the upstream end and the center of the downstream end of the catalyst portion are both located on the left or right side of the plane passing through the center in the left-right direction of the front wheel portion. That is, when viewed in the front-rear direction, the catalyst part is arranged close to the left or right part of the vehicle. Therefore, when the front wheel portion includes only one front wheel, the central axis of the catalyst portion is not disposed directly behind the center in the left-right direction of one front wheel. Suppose that the central axis of the catalyst part is arranged directly behind the center of the front wheel in the left-right direction.
  • the straddle-type vehicle of the present invention preferably has the following configuration.
  • the catalyst portion is arranged so that the flow direction of the exhaust gas flowing through the catalyst portion is along the vertical direction.
  • the catalyst part is arranged so that the flow direction of the exhaust gas flowing inside is in a direction along the vertical direction. Therefore, the length in the vertical direction of the catalyst portion is longer than that in the case where the catalyst portion is arranged so that the flow direction of the exhaust gas flowing inside is a direction along the front-rear direction.
  • the vertical length of the catalyst part is long, the surface area of the catalyst part 62 as viewed from the front is large. Therefore, the heat of the catalyst part is more easily radiated toward the front.
  • more than half of the catalyst portion is exposed between the front end of the left catalyst cover portion and the front end of the right catalyst cover portion. Therefore, even when the vehicle is stopped, hot air is less likely to stay around the catalyst portion.
  • the direction along the vertical direction is not limited to the direction parallel to the vertical direction. Including a direction inclined within a range of ⁇ 45 ° with respect to the vertical direction.
  • the straddle-type vehicle of the present invention preferably has the following configuration.
  • the engine body has at least one cylinder hole that defines a part of the at least one combustion chamber.
  • the engine body is arranged such that a central axis of the at least one cylinder hole is along the vertical direction.
  • the engine body is arranged such that the center axis of the cylinder hole is along the vertical direction.
  • the fact that the central axis is along the vertical direction is not limited to the case where the central axis is parallel to the vertical direction. This includes the case where the central axis is inclined within a range of ⁇ 45 ° with respect to the vertical direction.
  • the cylinder hole defines a part of the combustion chamber.
  • the engine body is long in the direction of the central axis of the cylinder hole. Therefore, the length of the engine body in the vertical direction is longer than that in the case where the engine body is arranged so that the center axis of the cylinder hole is along the front-rear direction.
  • the length of the engine body in the vertical direction is long, the surface area of the engine body viewed from the front is large. Therefore, the heat in the combustion chamber is more easily radiated from the front surface of the engine body toward the front. As described above, when viewed from the front, more than half of the catalyst portion is exposed between the front end of the left catalyst cover portion and the front end of the right catalyst cover portion. Therefore, even when the vehicle is stopped, hot air is less likely to stay around the catalyst portion. If the engine body is arranged so that the center axis of the cylinder hole is along the front-rear direction, the length of the engine body in the front-rear direction is long. Therefore, the heat in the combustion chamber tends to be radiated downward from the lower surface of the engine body.
  • the straddle-type vehicle of the present invention preferably has the following configuration.
  • the engine body includes a crankshaft having a central axis along the left-right direction.
  • the catalyst portion is disposed in front of the front-rear direction with respect to the central axis of the crankshaft.
  • the center axis of the crankshaft of the engine body is along the left-right direction.
  • the catalyst portion is disposed in front of the center axis of the crankshaft. Therefore, the path length from the combustion chamber to the catalyst part can be further shortened. Therefore, higher temperature exhaust gas flows into the catalyst part. Therefore, when the engine unit is cold started, the time until the main catalyst is activated from the inactive state can be further shortened.
  • the straddle-type vehicle of the present invention preferably has the following configuration.
  • the engine body is provided at a lower portion of the engine body, and includes a crankcase portion including the crankshaft, and a cylinder portion connected to an upper end portion of the crankcase portion and having the at least one combustion chamber.
  • At least a part of the catalyst portion is disposed in front of the crankcase portion in the front-rear direction.
  • the engine body has a crankcase part and a cylinder part.
  • the crankcase part is provided in the lower part of the engine body.
  • the crankcase part includes a crankshaft.
  • the cylinder part is connected to the upper end part of the crankcase part.
  • the cylinder part has at least one combustion chamber.
  • At least a part of the catalyst part is disposed in front of the crankcase part.
  • the catalyst part is disposed in front of the cylinder part and is not disposed in front of the crankcase part.
  • the path length from the combustion chamber to the catalyst part is too short. If the path length from the combustion chamber to the catalyst portion is too short, the temperature of the exhaust gas flowing into the main catalyst may become too high. As a result, the main catalyst may be deteriorated. Therefore, the deterioration of the main catalyst can be suppressed by arranging at least a part of the catalyst portion in front of the crankcase portion.
  • the saddle riding type vehicle of the present invention preferably has the following configuration. When viewed in the left-right direction, at least a part of the catalyst portion is disposed in front of the front-rear direction on a straight line that is orthogonal to the center axis of the cylinder hole and passes through the center axis of the crankshaft.
  • a straight line L that is perpendicular to the center axis of the cylinder hole and passes through the center axis of the crankshaft when viewed in the left-right direction is defined as a straight line L.
  • the path length from the combustion chamber to the catalyst portion is shorter than when the entire catalyst portion is disposed behind the straight line L when viewed in the left-right direction. Therefore, the temperature of the exhaust gas flowing into the main catalyst becomes high. Thereby, when the engine unit is cold-started, the time until the main catalyst is activated from the inactive state can be further shortened.
  • the lower end of the catalyst part may be positioned significantly below the lower end of the engine body. In that case, if the separation distance between the catalyst unit and the ground is to be secured, the vehicle is increased in size in the vertical direction. Therefore, when at least a part of the catalyst portion is disposed in front of the straight line L when viewed in the left-right direction, it is possible to suppress an increase in the size of the vehicle in the vertical direction.
  • the straddle-type vehicle of the present invention preferably has the following configuration.
  • the vehicle body cover has a horizontal separation distance between a rear end of the left catalyst cover portion and a rear end of the right catalyst cover portion in an arbitrary horizontal plane passing through the catalyst portion, so that the front end of the left catalyst cover portion is And the front end of the right catalyst cover portion are formed to be larger than the separation distance in the left-right direction.
  • the distance in the left-right direction between the rear end of the left catalyst cover portion and the rear end of the right catalyst cover portion in an arbitrary horizontal plane passing through the catalyst portion is defined as a distance Db.
  • a distance in the left-right direction between the front end of the left catalyst cover portion and the front end of the right catalyst cover portion in the horizontal plane is defined as a distance Df.
  • the separation distance Db is larger than the separation distance Df. Since the separation distance Db is large, it is easy to secure a gap between the member covered by the rear portion of the left catalyst cover portion and the rear end of the left catalyst cover portion. Therefore, it is easy to exhaust the hot air between the left catalyst cover and the catalyst part from the rear end of the left catalyst cover part to the rear.
  • the separation distance Db is large, it is easy to secure a gap between the member covered by the rear portion of the right catalyst cover portion and the rear end of the right catalyst cover portion. Therefore, the hot air between the right catalyst cover part and the catalyst part can be easily discharged rearward from the rear end of the right catalyst cover part. For these reasons, even if the vehicle is stopped, hot air is unlikely to be accumulated around the catalyst portion. Therefore, it is possible to further suppress the thermal influence on the parts arranged around the catalyst part and the deterioration of the main catalyst.
  • the member covered by the rear portion of the left catalyst cover portion may be a catalyst portion or a member other than the catalyst portion. The same applies to the member covered at the rear part of the right catalyst cover part.
  • the straddle-type vehicle of the present invention preferably has the following configuration.
  • the catalyst part includes a cylinder part that houses the main catalyst and is connected to the downstream end of the upstream exhaust passage part, and a catalyst protector part that covers at least a part of the outer surface of the cylinder part.
  • the catalyst part has a main catalyst, a cylinder part, and a catalyst protector part.
  • the cylinder portion accommodates the main catalyst.
  • the cylinder portion is connected to the downstream end of the upstream exhaust passage portion.
  • the catalyst protector portion covers at least a part of the outer surface of the cylindrical portion.
  • the straddle-type vehicle of the present invention preferably has the following configuration.
  • the exhaust device is connected to a downstream end of the catalyst unit and has a downstream exhaust passage portion having the atmospheric discharge port, and at least one downstream sub-catalyst disposed in the downstream exhaust passage portion to purify exhaust gas, Is provided.
  • the exhaust device has the downstream exhaust passage portion.
  • the downstream exhaust passage portion is connected to the downstream end of the catalyst portion.
  • the downstream exhaust passage portion has an atmospheric discharge port.
  • the exhaust device has at least one downstream sub-catalyst that purifies the exhaust gas.
  • At least one downstream sub-catalyst is disposed in the downstream exhaust passage portion.
  • the straddle-type vehicle of the present invention preferably has the following configuration.
  • the engine main body has at least one internal exhaust passage portion that connects the at least one combustion chamber and the upstream exhaust passage portion.
  • the exhaust device includes at least one upstream sub-catalyst that is disposed in at least one of the at least one internal exhaust passage portion and the upstream exhaust passage portion and purifies exhaust gas.
  • the engine body has at least one internal exhaust passage portion.
  • the internal exhaust passage connects the combustion chamber and the upstream exhaust passage.
  • the exhaust device has at least one upstream sub-catalyst that purifies the exhaust gas.
  • the at least one upstream sub-catalyst is disposed in at least one of the at least one internal exhaust passage portion and the upstream exhaust passage portion.
  • the straddle-type vehicle of the present invention preferably has the following configuration. At least a part of the upstream exhaust passage portion is configured by a multiple tube including an inner tube and at least one outer tube covering the inner tube.
  • At least a part of the upstream exhaust passage portion is configured by multiple tubes.
  • the multiple tube includes an inner tube and at least one outer tube covering the inner tube.
  • the saddle riding type vehicle of the present invention preferably has the following configuration.
  • the engine body has an oil filter at a front portion thereof.
  • the exhaust device and the oil filter are configured such that at least a part of the oil filter is exposed when the exhaust device and the oil filter are viewed from the front in the front-rear direction.
  • an oil filter is provided at the front of the engine body.
  • the exhaust device and the oil filter are viewed from the front, at least a part of the oil filter is exposed. Therefore, when the exhaust device and the oil filter are viewed from the front, the front of the oil filter is not completely covered by the catalyst portion. Therefore, even if the oil filter is arranged around the catalyst part, the oil filter is not easily affected by the heat of the catalyst part.
  • FIG. 1 is a right side view of a motorcycle according to an embodiment. It is the II-II sectional view taken on the line of FIG. It is a right view of an engine unit. It is a front view of an engine unit. It is a right view of a part of an engine unit. It is a front view of a part of an engine unit. It is a partial schematic diagram of an engine unit. It is a partial schematic diagram of an engine unit. It is sectional drawing of a muffler part. It is a top view of an exhaust apparatus. It is a right view of the engine unit of a modification.
  • FIG. 10 is a right side view of a part of an engine unit of a first modification.
  • FIG. 10 is a right side view of a part of an engine unit of a first modification.
  • FIG. 10 is a right side view of a part of an engine unit of a second modification.
  • FIG. 9 is a cross-sectional view of a turbocharger of Modification 2.
  • FIG. 10 is a side view of a turbocharger of a second modification. It is a right view of a part of a modified engine unit. It is sectional drawing of the upstream exhaust passage part of a modification. It is a top view of a part of an engine unit of a modification. It is a partial front view of the engine unit of a modification.
  • the front-rear direction is the front-rear direction of the vehicle as viewed from a rider seated on a seat 9 (described later) of the motorcycle 1.
  • the left-right direction is the left-right direction of the vehicle when viewed from the rider seated on the seat 9.
  • the vehicle left-right direction is the same as the vehicle width direction.
  • the arrow F direction and the arrow B direction of each drawing represent the front and the rear
  • the arrow L direction and the arrow R direction represent the left side and the right side
  • the arrow U direction and the arrow D direction are Represents the top and bottom.
  • the motorcycle 1 includes a front wheel portion 2, a rear wheel portion 3, and a vehicle body frame 4.
  • the vehicle body frame 4 has a head pipe 4a at the front thereof.
  • a steering shaft (not shown) is rotatably inserted into the head pipe 4a.
  • the upper end portion of the steering shaft is connected to the handle unit 5.
  • An upper end portion of a pair of front forks 6 is fixed to the handle unit 5.
  • a lower end portion of the front fork 6 supports the front wheel portion 2.
  • the front fork 6 is configured to absorb an impact in the vertical direction.
  • the front wheel portion 2 is composed of one front wheel.
  • the front wheel includes a tire 2a and a wheel 2b.
  • the upper part of the front wheel part 2 is covered with a front fender 14.
  • a disc brake 15 is attached to the front wheel portion 2.
  • the handle unit 5 has one handle bar 12 extending in the left-right direction.
  • Grips 13 ⁇ / b> L and 13 ⁇ / b> R are provided at the left and right ends of the handle bar 12.
  • the right grip 13R is an accelerator grip that adjusts the output of the engine.
  • a pair of swing arms 7 are swingably supported on the body frame 4.
  • the rear end portion of the swing arm 7 supports the rear wheel portion 3.
  • the rear wheel portion 3 is composed of one rear wheel.
  • One end of the rear suspension 8 is attached to a position behind the swing center of each swing arm 7.
  • the other end of the rear suspension 8 is attached to the vehicle body frame 4.
  • the rear suspension 8 is configured to absorb an impact in the vertical direction. 1 and 2 show the state in which the front fork 6 and the rear suspension 8 have the longest vertical lengths. That is, a state in which the vehicle body frame 4 is at the uppermost position with respect to the front wheel portion 2 and the rear wheel portion 3 is displayed. The same applies to FIGS. 3, 4 and 5 described later.
  • the vehicle body frame 4 supports the seat 9 and the fuel tank 10.
  • the fuel tank 10 is disposed in front of the seat 9.
  • the vehicle body frame 4 supports the engine unit 11.
  • the engine unit 11 may be directly connected to the vehicle body frame 4 or indirectly connected thereto.
  • the engine unit 11 is disposed below the fuel tank 10.
  • the engine unit 11 is disposed below the upper end of the seat 9.
  • the front wheel portion 2 is disposed in front of the engine unit 11.
  • the rear wheel portion 3 is disposed behind the engine unit 11 when viewed in the left-right direction.
  • the lateral width of the engine unit 11 is larger than the lateral width of the front wheel portion 2.
  • the lateral width of the engine unit 11 is larger than the lateral width of the rear wheel portion 3.
  • the width in the left-right direction is the maximum length in the left-right direction.
  • the vehicle body frame 4 supports a battery (not shown).
  • the battery supplies power to a control device (not shown) that controls the engine unit 11 and electronic devices such as various sensors.
  • the vehicle body frame 4 supports the vehicle body cover 100 and the front cowl 105.
  • the outline of the vehicle body cover 100 is indicated by a two-dot chain line, and a portion that is originally hidden by the vehicle body cover 100 is indicated by a solid line.
  • the front cowl 105 is provided with a headlight 105a and a windbreak plate 105b.
  • the vehicle body cover 100 includes a left catalyst cover portion 101 and a right catalyst cover portion 102. As shown in FIG. 2, the left catalyst cover portion 101 is disposed on the left portion of the motorcycle 1. The right catalyst cover portion 102 is disposed on the right portion of the motorcycle 1. As shown in FIG.
  • the right catalyst cover portion 102 covers a part of the vehicle body frame 4, a part of the engine unit 11, and a part of the exhaust device 60 as viewed from the right.
  • the left catalyst cover 101 covers a part of the vehicle body frame 4, a part of the engine unit 11, and a part of the exhaust device 60 as viewed from the left.
  • Direction indicators 106L and 106R are disposed on the surfaces of the left catalyst cover 101 and the right catalyst cover 102, respectively. The direction indicators 106L and 106R pass through the cover portions 101 and 102 and are supported by the vehicle body frame 4.
  • the engine unit 11 includes an engine body 20, a water cooling device 40, and an exhaust device 60. Further, as shown in FIG. 7, the engine unit 11 has an intake device 50. The engine body 20 is connected to the water cooling device 40, the intake device 50, and the exhaust device 60, respectively.
  • the engine unit 11 is a three-cylinder engine having three cylinders.
  • the engine unit 11 is a 4-stroke engine.
  • a 4-stroke engine is an engine that repeats an intake stroke, a compression stroke, a combustion stroke (expansion stroke), and an exhaust stroke. The timing of the combustion stroke in the three cylinders is different.
  • FIG. 7 shows only one of the three cylinders of the engine body 20 and omits the remaining two cylinders.
  • the engine unit 11 is a water-cooled engine.
  • the engine body 20 is configured to be cooled with cooling water.
  • High-temperature cooling water that has absorbed the heat of the engine body 20 is supplied from the engine body 20 to the water cooling device 40.
  • the water cooling device 40 lowers the temperature of the cooling water supplied from the engine body 20 and returns it to the engine body 20.
  • the water cooling device 40 includes a radiator 41, a radiator fan (not shown), and a reservoir tank 42.
  • the radiator 41 is disposed in front of the upper portion of the engine body 20.
  • the radiator fan is disposed between the engine body 20 and the radiator 41.
  • the reservoir tank 42 is disposed in front of the lower part of the engine body 20.
  • the reservoir tank 42 is disposed in front of the right part of the engine body 20.
  • the reservoir tank 42 may not be disposed in front of the right part of the engine body 20.
  • the engine unit 11 has a water pump (not shown) for circulating cooling water.
  • the water pump is provided inside the engine body
  • the engine main body 20 includes a crankcase portion 20 a and a cylinder portion 20 b.
  • the crankcase portion 20 a is provided at the lower part of the engine body 20.
  • the cylinder part 20 b is provided on the upper part of the engine body 20.
  • the cylinder part 20b is connected to the upper end part of the crankcase part 20a.
  • the crankcase portion 20a has a crankcase 21 and an oil pan 26.
  • the crankcase portion 20 a has a crankshaft 27 that is accommodated in the crankcase 21.
  • the crankcase portion 20a includes a transmission, a clutch, a starter motor, and a generator. These are also accommodated in the crankcase 21.
  • a central axis Cr of the crankshaft 27 is referred to as a crank axis Cr.
  • the crank axis Cr is along the left-right direction. More specifically, the crank axis Cr is parallel to the left-right direction.
  • the oil pan 26 is provided below the crankcase portion 20a.
  • the oil pan 26 is connected to the lower end of the crankcase 21.
  • the boundary between the oil pan 26 and the crankcase 21 is substantially straight.
  • an extension of the boundary line between the crankcase 21 and the oil pan 26 is defined as a straight line Lp.
  • the straight line Lp is along the front-rear direction.
  • the straight line Lp is inclined so as to go downward as it goes forward.
  • the straight line Lp may be orthogonal to a cylinder axis Cy described later.
  • the right part of the oil pan 26 is recessed with respect to the left part of the oil pan 26.
  • the right part of the oil pan 26 is located above the left part of the oil pan 26.
  • a part of the exhaust device 60 is disposed inside the recess of the oil pan 26.
  • Lubricating oil is stored in the oil pan 26.
  • the crankcase part 20 a has an oil pump (not shown) that sucks up the lubricating oil stored in the oil pan 26.
  • an oil filter 45 and an oil cooler 46 are provided at the front portion of the crankcase portion 20a.
  • the oil cooler 46 is disposed substantially at the center in the left-right direction of the crankcase portion 20a.
  • the oil filter 45 is disposed on the left side of the oil cooler 46.
  • a plane passing through the center in the left-right direction of the front wheel portion 2 and the rear wheel portion 3 is defined as C0.
  • the center in the left-right direction of the front wheel portion 2 and the rear wheel portion 3 is also the center in the left-right direction of the motorcycle 1.
  • the center in the left-right direction of the motorcycle 1 may be referred to as the center C0 in the left-right direction of the motorcycle 1.
  • the center in the left-right direction of the front wheel part 2 may be referred to as the center C0 in the left-right direction of the front wheel part 2.
  • the oil cooler 46 is disposed at a position overlapping the center C0 in the left-right direction of the motorcycle 1.
  • the oil filter 45 is disposed to the left of the center C0 in the left-right direction of the motorcycle 1. As shown in FIG. 5, the oil cooler 46 projects forward from the front surface of the crankcase 21. Similar to the oil cooler 46, the oil filter 45 also projects forward from the front surface of the crankcase 21.
  • the oil filter 45 has a built-in filter main body (not shown). The filter body removes foreign substances contained in the lubricating oil.
  • the oil filter 45 is detachably attached to the crankcase 21 so that the filter body can be replaced.
  • the cylinder portion 20 b includes a cylinder body 22, a cylinder head 23, and a head cover 24.
  • the cylinder body 22 is connected to the upper end portion of the crankcase 21.
  • the cylinder head 23 is connected to the upper end portion of the cylinder body 22.
  • the head cover 24 is connected to the upper end portion of the cylinder head 23.
  • the cylinder body 22 is formed with a cylinder hole 22a.
  • Three cylinder holes 22 a are formed in the cylinder body 22.
  • the three cylinder holes 22a are adjacent to each other in the left-right direction.
  • a piston 28 is slidably accommodated in each cylinder hole 22a.
  • the three pistons 28 are connected to one crankshaft 27 via three connecting rods 29.
  • a cooling passage 22b through which cooling water flows is formed.
  • the central axis Cy of the cylinder hole 22a is referred to as a cylinder axis Cy.
  • the three cylinder axes Cy are parallel. When viewed in the left-right direction, the three cylinder axes Cy coincide. As shown in FIGS. 3 and 5, the cylinder axis Cy does not intersect the crank axis Cr. Note that the cylinder axis Cy may intersect the crank axis Cr.
  • the cylinder axis Cy is along the vertical direction. When viewed in the left-right direction, the cylinder axis Cy is inclined in the front-rear direction with respect to the up-down direction. The cylinder axis Cy is inclined such that the cylinder portion 20b is inclined forward.
  • the cylinder axis Cy is inclined so as to go forward as it goes upward.
  • the tilt angle of the cylinder axis Cy relative to the vertical direction is defined as a tilt angle ⁇ cy.
  • the inclination angle ⁇ cy is not limited to the angle shown in FIGS.
  • the inclination angle ⁇ cy is not less than 0 degrees and not more than 45 degrees.
  • a combustion chamber 30 is formed in the cylinder portion 20b.
  • Three combustion chambers 30 are formed in the cylinder portion 20b.
  • the three combustion chambers 30 are adjacent to each other in the left-right direction.
  • Each combustion chamber 30 is formed by the lower surface of the cylinder head 23, the cylinder hole 22 a, and the upper surface of the piston 28. That is, a part of the combustion chamber 30 is partitioned by the inner surface of the cylinder hole 22a.
  • a straight line passing through the crank axis Cr and parallel to the vertical direction when viewed in the left-right direction is defined as a straight line La1.
  • the three combustion chambers 30 are disposed in front of the straight line La1. That is, when viewed in the left-right direction, the three combustion chambers 30 are disposed in front of the crank axis Cr.
  • the tip of the spark plug 31 is disposed in the combustion chamber 30.
  • the tip of the spark plug 31 generates a spark discharge.
  • the air-fuel mixture in the combustion chamber 30 is ignited.
  • the air-fuel mixture is an air-fuel mixture.
  • the spark plug 31 is connected to the ignition coil 32.
  • the ignition coil 32 stores electric power for causing spark discharge of the spark plug 31.
  • the ignition plug 31 and the ignition coil 32 constitute an ignition device.
  • an internal intake passage portion 33 and an internal exhaust passage portion 34 are formed.
  • path part means the structure which forms a path
  • the path means a space through which gas or the like passes.
  • the internal intake passage portion 33 is connected to the combustion chamber 30.
  • the internal intake passage portion 33 is provided for each combustion chamber 30.
  • the internal exhaust passage portion 34 is connected to the combustion chamber 30.
  • the internal exhaust passage portion 34 is provided for each combustion chamber 30.
  • the internal intake passage portion 33 is provided for introducing air into the combustion chamber 30.
  • the internal exhaust passage portion 34 is provided to exhaust the exhaust gas generated in the combustion chamber 30 from the combustion chamber 30.
  • the combustion chamber intake port 33a and the combustion chamber exhaust port 34a are formed on the surface defining the combustion chamber 30 of the cylinder head 23.
  • the combustion chamber intake port 33 a is formed at the downstream end of the internal intake passage portion 33.
  • the combustion chamber exhaust port 34 a is formed at the upstream end of the internal exhaust passage portion 34.
  • An intake port 33 b and an exhaust port 34 b are formed on the outer surface of the cylinder head 23.
  • the intake port 33 b is formed at the upstream end of the internal intake passage portion 33.
  • the exhaust port 34 b is formed at the downstream end of the internal exhaust passage portion 34.
  • the number of combustion chamber intake ports 33a provided for one combustion chamber 30 may be one or two or more. For each combustion chamber 30, only one intake port 33b is provided.
  • the internal intake passage portion 33 is formed in a bifurcated shape.
  • the number of combustion chamber exhaust ports 34 a provided for one combustion chamber 30 may be one or two or more.
  • only one exhaust port 34b is provided.
  • the air inlet 33 b is formed on the front surface of the cylinder head 23.
  • the exhaust port 34 b is formed on the front surface of the cylinder head 23.
  • the three exhaust ports 34b are adjacent along the left-right direction.
  • an intake valve 37 that opens and closes the combustion chamber intake port 33 a is disposed in the internal intake passage portion 33.
  • One intake valve 37 is provided for each combustion chamber intake port 33a.
  • An exhaust valve 38 that opens and closes the combustion chamber exhaust port 34 a is disposed in the internal exhaust passage portion 34.
  • One exhaust valve 38 is provided for each combustion chamber exhaust port 34a.
  • the intake valve 37 and the exhaust valve 38 are driven by a valve gear (not shown) housed in the cylinder head 23.
  • the valve gear operates in conjunction with the crankshaft 27.
  • the valve operating mechanism may have a variable valve timing device.
  • a known variable valve timing device is applied.
  • the variable valve timing device is configured to change the opening / closing timing of the intake valve and / or the exhaust valve.
  • the engine main body 20 has an injector 54.
  • the injector 54 is a fuel supply device that supplies fuel to the combustion chamber 30.
  • One injector 54 is provided for each combustion chamber 30.
  • the injector 54 is arranged so as to inject fuel in the internal intake passage portion 33.
  • the injector 54 is connected to the fuel tank 10.
  • a fuel pump (not shown) is arranged inside the fuel tank 10. The fuel pump pumps the fuel in the fuel tank 10 toward the injector 54.
  • the injector 54 may be arranged to inject fuel in the combustion chamber 30. Further, the injector 54 may be arranged so as to inject fuel in a branch intake passage portion 51 described later of the intake device 50.
  • the engine body 20 may include a carburetor instead of the injector 54 as a fuel supply device. The carburetor supplies fuel into the combustion chamber 30 using the negative pressure of the combustion chamber 30.
  • the engine body 20 has an engine rotation speed sensor 71 and an engine temperature sensor 72.
  • the engine rotation speed sensor 71 detects the rotation speed of the crankshaft 27, that is, the engine rotation speed.
  • the engine temperature sensor 72 detects the temperature of the engine body 20. In the present embodiment, the engine temperature sensor 72 indirectly detects the temperature of the cylinder body 22 by detecting the temperature of the cooling water in the cooling passage 22b. The engine temperature sensor 72 may directly detect the temperature of the cylinder body 22.
  • the intake device 50 has one intake passage portion 52 and three branched intake passage portions 51.
  • the intake passage 52 has an air inlet 52a facing the atmosphere.
  • the air inlet 52 a is formed at the upstream end of the intake passage portion 52.
  • the intake passage 52 is provided with an air cleaner 53 for purifying air.
  • the downstream end of the intake passage portion 52 is connected to the upstream ends of the three branched intake passage portions 51.
  • the downstream ends of the three branch intake passage portions 51 are respectively connected to three intake ports 33 b formed on the rear surface of the cylinder head 23.
  • the air inlet 52a sucks air from the atmosphere.
  • the air flowing into the intake passage portion 52 from the air intake port 52 a is supplied to the engine body 20 through the three branched intake passage portions 51.
  • a throttle valve 55 is disposed in the branch intake passage portion 51.
  • One throttle valve 55 is provided for each combustion chamber 30.
  • the opening degree of the throttle valve 55 is changed by the rider turning the accelerator grip 13R.
  • the branch intake passage section 51 is provided with a throttle opening sensor (throttle position sensor) 73, an intake pressure sensor 74, and an intake air temperature sensor 75.
  • the throttle opening sensor 73 outputs a signal representing the throttle opening by detecting the position of the throttle valve 55.
  • the throttle opening is the opening of the throttle valve 55.
  • the intake pressure sensor 74 detects the internal pressure of the branch intake passage portion 51.
  • the intake air temperature sensor 75 detects the temperature of the air in the branch intake passage portion 51.
  • the exhaust device 60 includes an upstream exhaust passage portion 61, a catalyst portion 62, and a downstream exhaust passage portion 63.
  • upstream and downstream in the exhaust gas flow direction in the exhaust device 60 and the internal exhaust passage portion 34 are simply referred to as upstream and downstream.
  • the upstream exhaust passage portion 61 includes three independent exhaust passage portions 64 and an upstream collective exhaust passage portion 65.
  • One independent exhaust passage portion 64 is provided for each combustion chamber 30.
  • the downstream exhaust passage portion 63 includes a downstream collective exhaust passage portion 66 and a muffler portion 67.
  • the upstream ends of the three independent exhaust passage portions 64 are respectively connected to three exhaust ports 34 b formed on the front surface of the cylinder head 23.
  • the downstream ends of the three independent exhaust passage portions 64 are connected to the upstream ends of the upstream collective exhaust passage portion 65.
  • the upstream collective exhaust passage portion 65 collects (combines) the exhaust gas discharged from the three independent exhaust passage portions 64.
  • the downstream end of the upstream collective exhaust passage portion 65 is connected to the upstream end of the catalyst portion 62.
  • the catalyst unit 62 includes a main catalyst 62a that purifies exhaust gas.
  • the downstream end of the catalyst portion 62 is connected to the upstream end of the downstream collective exhaust passage portion 66.
  • the downstream end of the downstream collecting exhaust passage portion 66 is connected to the upstream end of the muffler portion 67.
  • the muffler part 67 has an atmospheric discharge port 67a facing the atmosphere.
  • the exhaust gas discharged from the three exhaust ports 34 b of the engine body 20 passes through the upstream exhaust passage portion 61 and flows into the catalyst portion 62.
  • the exhaust gas is purified by passing through the main catalyst 62a, and then exhausted from the atmospheric discharge port 67a through the downstream exhaust passage portion 63.
  • a path from the combustion chamber 30 to the atmospheric discharge port 67a is referred to as an exhaust path 69.
  • the engine unit 11 has three exhaust paths 69.
  • the exhaust path 69 is a space through which exhaust gas discharged from one combustion chamber 30 passes.
  • the exhaust passage 69 is formed by the internal exhaust passage portion 34, the upstream exhaust passage portion 61, the catalyst portion 62, and the downstream exhaust passage portion 63.
  • the exhaust device 60 includes an exhaust pipe unit 56, a first collective exhaust pipe 57, a second collective exhaust pipe 58, and a muffler portion 67.
  • the exhaust pipe unit 56 includes a first exhaust passage portion 56A, a second exhaust passage portion 56B, and a third exhaust passage portion 56C.
  • the first to third exhaust passage portions 56A, 56B, and 56C are arranged in this order from right to left.
  • the upstream ends of the first to third exhaust passage portions 56A, 56B, and 56C are connected to the three exhaust ports 34b of the engine body 20, respectively.
  • a passage having a substantially circular cross section is formed inside the first to third exhaust passage portions 56A, 56B, and 56C.
  • Mounting flange portions 56Af, 56Bf, and 56Cf are provided in the vicinity of the upstream ends of the first to third exhaust passage portions 56A, 56B, and 56C.
  • the mounting flange portions 56Af, 56Bf, and 56Cf are formed in a plate shape.
  • Bolt holes into which bolts are inserted are formed in the mounting flange portions 56Af, 56Bf, and 56Cf.
  • a portion of the first exhaust passage portion 56 ⁇ / b> A upstream from the attachment flange portion 56 ⁇ / b> Af is inserted inside the internal exhaust passage portion 34.
  • the mounting flange portions 56Af, 56Bf, and 56Cf are in contact with the outer surface of the engine body 20.
  • the mounting flange portions 56Af, 56Bf, and 56Cf are fixed to the outer surface of the engine body 20 by bolts.
  • the area of the connection portion between the outer surface of the engine body 20 and the exhaust pipe unit 56 is the sum of the areas of the mounting flange portions 56Af, 56Bf, and 56Cf.
  • the downstream ends of the first exhaust passage portion 56A and the third exhaust passage portion 56C are connected in the middle of the second exhaust passage portion 56B.
  • the downstream end of the second exhaust passage portion 56 ⁇ / b> B is connected to the upstream end of the first collective exhaust pipe 57.
  • the first exhaust passage portion 56A forms an independent exhaust passage portion 64A.
  • the independent exhaust passage portion 64A does not include a portion upstream of the mounting flange portion 56Af of the first exhaust passage portion 56A.
  • the upstream portion of the portion where the first exhaust passage portion 56A and the third exhaust passage portion 56C are connected forms an independent exhaust passage portion 64B.
  • the independent exhaust passage portion 64B does not include a portion upstream of the mounting flange portion 56Bf of the second exhaust passage portion 56B.
  • the third exhaust passage portion 56C forms an independent exhaust passage portion 64C.
  • the independent exhaust passage portion 64C does not include a portion upstream of the mounting flange portion 56Cf of the third exhaust passage portion 56C.
  • the independent exhaust passage portion 64 is a general term for the independent exhaust passage portions 64A, 64B, and 64C.
  • the main catalyst 62a is disposed inside the first collecting exhaust pipe 57.
  • a portion where the main catalyst 62a of the first collective exhaust pipe 57 is disposed is referred to as a cylindrical portion 62b.
  • the catalyst part 62 includes a cylindrical part 62b and a main catalyst 62a.
  • the upstream collective exhaust passage portion 65 is formed by a portion of the second exhaust passage portion 56B downstream of the independent exhaust passage portion 64B and a portion of the first collective exhaust pipe 57 upstream of the main catalyst 62a. In FIG. 6, hatching is displayed on the upstream collecting exhaust passage portion 65.
  • the downstream end of the first collective exhaust pipe 57 is connected to the upstream end of the second collective exhaust pipe 58.
  • the first collective exhaust pipe 57 is a pipe having a substantially circular cross section.
  • the second collective exhaust pipe 58 is a pipe having a circular cross section. As shown in FIG. 10, the first collective exhaust pipe 57 is formed by welding two left and right parts.
  • the downstream end of the second collective exhaust pipe 58 is connected to the muffler portion 67. Specifically, the downstream end of the second collective exhaust pipe 58 is disposed in the muffler portion 67.
  • the downstream collective exhaust passage portion 66 is formed by a portion of the first collective exhaust pipe 57 downstream of the main catalyst 62 a and the second collective exhaust pipe 58. However, the downstream collective exhaust passage portion 66 does not include a portion of the second collective exhaust pipe 58 that is disposed inside the muffler portion 67.
  • the three independent exhaust passage portions 64 are formed in a straight line when viewed in the left-right direction.
  • the flow direction of the exhaust gas in the independent exhaust passage portion 64 is a front diagonally downward direction.
  • the upstream collective exhaust passage portion 65 is bent.
  • the central axis of the catalyst part 62 is defined as a central axis C1.
  • the tilt angle with respect to the vertical direction of the central axis C1 is defined as a tilt angle ⁇ 1 .
  • the inclination angle ⁇ 1 is not limited to the angle shown in FIGS.
  • the inclination angle ⁇ 1 When viewed in the left-right direction, the inclination angle ⁇ 1 is not less than 0 degrees and not more than 45 degrees. Therefore, when viewed in the left-right direction, the central axis C1 of the catalyst unit 62 is along the vertical direction. Note that the inclination angle ⁇ 1 may be larger than 45 degrees. However, the inclination angle ⁇ 1 is 90 degrees or less. That is, when viewed in the left-right direction, the central axis C1 of the catalyst unit 62 may be along the front-rear direction. As shown in FIGS. 4 and 6, the central axis C1 of the catalyst portion 62 is substantially parallel to the vertical direction when viewed in the front-rear direction.
  • the central axis C1 of the catalyst part 62 is along the up-down direction. That is, the flow direction of the exhaust gas flowing inside the catalyst unit 62 is a direction along the vertical direction. More specifically, the flow direction of the exhaust gas flowing inside the catalyst unit 62 is a direction along the downward direction. The flow direction of the exhaust gas flowing through the inside of the catalyst part 62 is a rear obliquely downward direction.
  • the center of the upstream end of the catalyst unit 62 is located in front of the center of the downstream end of the catalyst unit 62.
  • the central axis C1 of the catalyst unit 62 may be inclined in the left-right direction with respect to the up-down direction.
  • the vicinity of the catalyst portion 62 of the downstream collecting exhaust passage portion 66 is bent when viewed in the left-right direction.
  • the flow direction of the exhaust gas in the downstream portion of the downstream collecting exhaust passage portion 66 from the bent portion is a direction along the front-rear direction.
  • the flow direction of the exhaust gas in the portion downstream of the bent portion of the downstream collective exhaust passage portion 66 is substantially parallel to the front-rear direction.
  • the vicinity of the downstream end of the upstream collective exhaust passage portion 65 is formed in a tapered shape so that its diameter increases toward the downstream. This tapered portion is formed in the first collective exhaust pipe 57.
  • the area of the cross section perpendicular to the flow direction of the exhaust gas in the vicinity of the downstream end of the upstream collective exhaust passage section 65 is defined as a cross sectional area A1.
  • a cross section perpendicular to the flow direction of the exhaust gas in the catalyst portion 62 is defined as a cross sectional area A2.
  • the cross-sectional area A1 is smaller than the cross-sectional area A2.
  • the vicinity of the upstream end of the downstream collective exhaust passage portion 66 is formed in a tapered shape so that the diameter decreases toward the downstream.
  • the area of the cross section orthogonal to the flow direction of the exhaust gas in the vicinity of the upstream end of the downstream collective exhaust passage section 66 is defined as a cross sectional area A3.
  • the cross-sectional area A3 is smaller than the cross-sectional area A2.
  • the muffler unit 67 is a device that reduces noise caused by exhaust gas. As shown in FIG. 10, a bracket 67 b is provided on the upper surface of the muffler portion 67. The bracket 67b is attached to the vehicle body frame 4. That is, the muffler part 67 is supported by the vehicle body frame 4.
  • the muffler portion 67 includes an outer cylinder 80 and a tail pipe 85.
  • the outer cylinder 80 is formed by welding two left and right parts.
  • the muffler portion 67 has four pipes 81 to 84 accommodated in the outer cylinder 80.
  • the inside of the outer cylinder 80 is partitioned into three expansion chambers 80a, 80b, and 80c by two separators 86 and 87.
  • the first pipe 81 is connected to the downstream end of the second collective exhaust pipe 58.
  • a portion of the second collective exhaust pipe 58 inside the outer cylinder 80 is included in the muffler portion 67.
  • the first pipe 81 communicates the second collecting exhaust pipe 58 and the central first expansion chamber 80a among the three expansion chambers.
  • the second pipe 82 communicates the first expansion chamber 80a with the second expansion chamber 80b behind the first expansion chamber 80a.
  • the third pipe 83 communicates the second expansion chamber 80b and the third expansion chamber 80c in front of the first expansion chamber 80a.
  • the fourth pipe 84 makes the third expansion chamber 80c communicate with the tail pipe 85 (see FIG. 10).
  • the fourth pipe 84 is bent in the second expansion chamber 80b.
  • the tail pipe 85 penetrates the right wall of the second expansion chamber 80b.
  • the tail pipe 85 is connected to the fourth pipe 84 in the second expansion chamber 80b.
  • the opening at the downstream end of the tail pipe 85 is an atmospheric discharge port 67a.
  • the exhaust gas discharged from the second collective exhaust pipe 58 includes the first pipe 81, the first expansion chamber 80a, the second pipe 82, the second expansion chamber 80b, the third pipe 83, the third expansion chamber 80c, and the fourth pipe 84.
  • the tail pipe 85 passes in this order. And exhaust gas is discharge
  • a sound absorbing material such as glass wool may be disposed, but it may not be disposed.
  • the internal structure of the muffler part 67 is not limited to the structure shown in FIG.
  • the catalyst unit 62 includes a main catalyst 62a and a cylindrical portion 62b.
  • the cylindrical portion 62 b is connected to the downstream end of the upstream collecting exhaust passage portion 65 and the upstream end of the downstream collecting exhaust passage portion 66.
  • the cylindrical portion 62b may be integrally formed with a part of the upstream collective exhaust passage portion 65.
  • the cylindrical portion 62b may be integrally formed with a part of the downstream collective exhaust passage portion 66.
  • the exhaust device 60 has no catalyst other than the main catalyst 62a.
  • the main catalyst 62a purifies the exhaust gas most in the plurality of exhaust paths 69 (see FIG. 7).
  • the main catalyst 62a is formed in a cylindrical shape.
  • the main catalyst 62a has a porous structure.
  • the porous structure means a structure in which a plurality of holes penetrating in the exhaust gas flow direction are formed.
  • the main catalyst 62a is a three-way catalyst.
  • the three-way catalyst is removed by oxidizing or reducing three substances of hydrocarbon (HC), carbon monoxide (CO), and nitrogen oxide (NOx) in the exhaust gas.
  • the three-way catalyst is one type of redox catalyst.
  • the main catalyst 62a may be a catalyst that removes any one or two of hydrocarbon, carbon monoxide, and nitrogen oxide.
  • the main catalyst 62a may not be a redox catalyst.
  • the main catalyst may be an oxidation catalyst that removes harmful substances only by oxidation.
  • the main catalyst may be a reduction catalyst that removes harmful substances only by reduction.
  • the main catalyst 62a has a base material and a catalytic material attached to the surface of the base material.
  • the catalytic material has a support and a noble metal.
  • the carrier has a function of attaching a noble metal to the substrate.
  • the noble metal has a function of purifying exhaust gas. Examples of the noble metal include platinum, palladium, and rhodium that remove hydrocarbons, carbon monoxide, and nitrogen oxides, respectively.
  • the main catalyst 62a may be a metal base catalyst or a ceramic base catalyst.
  • the metal base catalyst is a catalyst whose base is made of metal.
  • the ceramic base catalyst is a catalyst whose base is made of ceramic.
  • the base material of the metal base catalyst is formed, for example, by alternately stacking and winding metal corrugated plates and metal flat plates.
  • the base material of the ceramic base catalyst is, for example, a honeycomb structure.
  • the central axis C1 of the catalyst unit 62 is coaxial with the central axis of the main catalyst 62a.
  • the central axis C1 of the catalyst part 62 is the central axis of the cylinder part 62b.
  • the length of the catalyst portion 62 in the exhaust gas flow direction is the same as the length of the main catalyst 62a in the exhaust gas flow direction.
  • the center of the upstream end of the main catalyst 62a and the center of the upstream end of the catalyst unit 62 are at the same position.
  • the center of the downstream end of the main catalyst 62a and the center of the downstream end of the catalyst portion 62 are at the same position.
  • the length of the catalyst portion 62 in the exhaust gas flow direction is defined as a length Dc1 (not shown).
  • the maximum length in the direction orthogonal to the flow direction of the exhaust gas in the catalyst unit 62 is defined as a length Dc2 (not shown).
  • the length Dc1 is longer than the length Dc2.
  • the catalyst unit 62 is disposed in front of the engine body 20 when viewed in the left-right direction.
  • a plane passing through the uppermost end of the crankcase portion 20a and orthogonal to the vertical direction is defined as a plane Se1.
  • a plane passing through the lowest end of the crankcase portion 20a and orthogonal to the vertical direction is defined as a plane Se2.
  • the catalyst unit 62 is disposed between the plane Se1 and the plane Se2.
  • the catalyst portion 62 is disposed in front of the crankcase portion 20a.
  • the lower end of the catalyst unit 62 is disposed above the lower end of the engine body 20.
  • the lower end of the engine body 20 is also the lower end of the crankcase portion 20a.
  • the lower end of the catalyst unit 62 may be arranged below the lower end of the engine body 20.
  • a plane passing through the leftmost end of the engine body 20 and orthogonal to the left-right direction is defined as a plane Se3.
  • the plane Se3 passes through the leftmost end of the crankcase portion 20a.
  • a plane passing through the rightmost end of the engine body 20 and orthogonal to the left-right direction is defined as a plane Se4.
  • the plane Se4 passes through the rightmost end of the crankcase portion 20a.
  • the catalyst unit 62 is disposed between the plane Se3 and the plane Se4. When viewed from the front, the lower end portion of the catalyst portion 62 does not overlap the engine body 20.
  • the lower end portion of the catalyst portion 62 does not overlap the crankcase portion 20a.
  • a part of the catalyst unit 62 is disposed in front of the engine body 20.
  • a part of the catalyst part 62 is disposed in front of the crankcase part 20a.
  • the entire catalyst unit 62 may be disposed in front of the engine body 20. It is preferable that at least a part of the catalyst portion 62 is disposed in front of the engine body 20.
  • the whole catalyst part 62 may be arrange
  • the catalyst unit 62 When viewed in the left-right direction, the catalyst unit 62 is disposed in front of the straight line La1. That is, the catalyst unit 62 is disposed in front of the crank axis Cr. Further, the catalyst unit 62 is disposed below the crank axis Cr. Note that only a part of the catalyst unit 62 may be disposed below the crank axis Cr. It is preferable that at least a part of the catalyst unit 62 is disposed below the crank axis Cr. When viewed in the left-right direction, the catalyst unit 62 is disposed in front of the cylinder axis Cy.
  • a straight line La2 is a straight line perpendicular to the cylinder axis Cy and passing through the crank axis Cr when viewed in the left-right direction.
  • a part of the catalyst portion 62 is disposed in front (upward) of the straight line La2.
  • the entire catalyst portion 62 may be disposed in front of the straight line La2 when viewed in the left-right direction. It is preferable that at least a part of the catalyst portion 62 is disposed in front of the straight line La2 when viewed in the left-right direction.
  • the straight line Lp passes through the catalyst portion 62.
  • the straight line Lp is an extension of the boundary line between the crankcase 21 and the oil pan 26 when the engine unit 11 is viewed in the left-right direction.
  • the entire catalyst portion 62 may be disposed above (in front of) the straight line Lp when viewed in the left-right direction. Further, as viewed in the left-right direction, the entire catalyst unit 62 may be disposed below (backward) the straight line Lp.
  • the line segment arranged at the lowermost position among the line segments connecting the point on the contour line of the engine body 20 and the point on the contour line of the front wheel portion 2 when viewed in the left-right direction is Lw1.
  • the line segment Lw1 is a line segment that connects the lowermost end of the engine body 20 and the vicinity of the lowermost end of the front wheel portion 2.
  • the catalyst unit 62 is disposed above the line segment Lw1.
  • the line segment arranged at the uppermost position among the line segments connecting the points on the contour line of the engine body 20 and the points on the contour line of the front wheel portion 2 when viewed in the left-right direction is defined as a line segment Lw2.
  • the line segment Lw2 is a line segment that connects the uppermost end of the engine body 20 and the uppermost end of the front wheel portion 2 or the vicinity thereof.
  • the catalyst unit 62 When viewed in the left-right direction, the catalyst unit 62 is disposed below the line segment Lw2.
  • the catalyst unit 62 When viewed in the left-right direction, the catalyst unit 62 is disposed in a quadrangular region having two sides of the line segment Lw1 and the line segment Lw2.
  • the quadrangle having the line segment Lw1 and the line segment Lw2 as two sides is a quadrangle having vertices at both ends of the line segment Lw1 and both ends of the line segment Lw2.
  • the catalyst portion 62 When viewed in the left-right direction, the catalyst portion 62 is disposed within the above-described rectangular region and does not overlap the engine body 20. That is, the catalyst part 62 is disposed between the engine body 20 and the front wheel part 2 when viewed in the left-right direction. Note that only part of the catalyst portion 62 may be disposed between the engine body 20 and the front wheel portion 2 when viewed in the left-right direction. For example, a part of the catalyst unit 62 may be disposed below the line segment Lw1. It is preferable that at least a part of the catalyst part 62 is disposed between the engine body 20 and the front wheel part 2 when viewed in the left-right direction.
  • the relative position of the vehicle body frame 4 with respect to the front wheel portion 2 changes. Therefore, the relative position of the engine unit 11 with respect to the front wheel portion 2 changes.
  • the catalyst portion 62 When at least a part of the catalyst portion 62 is disposed between the engine body 20 and the front wheel portion 2 when viewed in the left-right direction, it is disposed regardless of the position of the engine unit 11 with respect to the front wheel portion 2. It does not mean that When at least a part of the catalyst portion 62 is disposed between the engine body 20 and the front wheel portion 2 when viewed in the left-right direction, it is disposed when the engine unit 11 is in any position with respect to the front wheel portion 2. It should be.
  • a horizontal plane passing through the upper end of the front wheel portion 2 is defined as a horizontal plane Sh1.
  • the catalyst unit 62 is disposed below the horizontal plane Sh1. That is, the catalyst unit 62 is disposed below the upper end of the front wheel unit 2.
  • the catalyst unit 62 is disposed below the horizontal surface Sh1 as long as the engine unit 11 is located at any position with respect to the front wheel unit 2.
  • a horizontal plane passing through the center of the front wheel portion 2 is defined as a horizontal plane Sh2.
  • the horizontal plane Sh2 passes through the catalyst unit 62. That is, at least a part of the catalyst unit 62 is disposed below the horizontal plane Sh2. Note that at least a part of the catalyst unit 62 may be disposed above the horizontal plane Sh2. The fact that at least a part of the catalyst portion 62 is disposed below the horizontal plane Sh2 is only required to be disposed when the engine unit 11 is in any position with respect to the front wheel portion 2.
  • the catalyst unit 62 is disposed on the right side of the motorcycle 1.
  • the center of the upstream end and the center of the downstream end of the catalyst unit 62 are not arranged on the center C0 in the left-right direction of the motorcycle 1.
  • the center of the upstream end and the center of the downstream end of the catalyst unit 62 are located to the right of the center C0 in the left-right direction of the motorcycle 1.
  • at least a portion of the catalyst unit 62 is disposed to the right of the center C0 in the left-right direction of the motorcycle 1.
  • the catalyst unit 62 When viewed in the front-rear direction, the catalyst unit 62 overlaps with the oil cooler 46. The catalyst part 62 does not overlap the oil filter 45 when viewed in the front-rear direction. When viewed in the front-rear direction, the catalyst unit 62 is disposed on the right side of the oil filter 45. When the exhaust device 60 and the oil filter 45 are viewed from the front, the oil filter 45 is exposed. Therefore, the oil filter 45 can be easily removed from the engine body 20. Therefore, the oil filter 45 can be easily replaced. Note that a part of the exhaust device 60 may overlap the oil filter 45 when viewed in the front-rear direction. Even in this case, it is easier to remove the oil filter 45 than when the entire oil filter 45 is hidden by the exhaust device 60.
  • the exhaust device 60 and the oil filter 45 are viewed from the front, it is preferable that at least a part of the oil filter 45 is exposed. Thereby, even if the oil filter 45 is arranged around the catalyst part 62, the oil filter 45 is not easily affected by the heat of the catalyst part 62.
  • the average value of the path length from the combustion chamber 30 to the upstream end of the catalyst unit 62 in the three exhaust paths 69 is defined as a path length Da1.
  • a path length from the downstream end of the catalyst unit 62 to the atmospheric discharge port 67a is defined as a path length Db1.
  • the path length Da1 is shorter than the path length Db1.
  • the average value of the path length from the exhaust port 34b to the upstream end of the catalyst unit 62 in the three exhaust paths 69 is defined as a path length Da2.
  • a path length from the downstream end of the catalyst unit 62 to the upstream end of the muffler unit 67 is defined as a path length Db2.
  • the path length Da2 is shorter than the path length Db2.
  • the path length Da1 is shorter than the path length Db2.
  • the path length Da1 may be longer than the path length Db2.
  • the path length Da2 may be longer than the path length Db2.
  • the path length in the expansion chamber of the muffler part 67 is defined as follows.
  • the path length in the first expansion chamber 80a from the downstream end of the first pipe 81 to the upstream end of the second pipe 82 is taken as an example.
  • This path length is the length of the path that connects the center of the downstream end of the first pipe 81 to the center of the upstream end of the second pipe 82 in the shortest distance. That is, the path length in the expansion chamber of the muffler portion 67 is the length of the path that connects the center of the inflow port of the expansion chamber to the center of the outflow port of the expansion chamber in the shortest distance.
  • the exhaust device 60 has an upstream oxygen sensor 76 and a downstream oxygen sensor 77.
  • the upstream oxygen sensor 76 is provided in the upstream collecting exhaust passage portion 65.
  • the upstream oxygen sensor 76 detects the oxygen concentration in the exhaust gas in the upstream collecting exhaust passage portion 65.
  • the downstream oxygen sensor 77 is provided in the downstream collective exhaust passage section 66.
  • the downstream oxygen sensor 77 detects the oxygen concentration in the exhaust gas in the downstream collecting exhaust passage portion 66. Note that the exhaust device 60 may not include the downstream oxygen sensor 77.
  • the engine unit 11 has a control device (not shown) that controls the operation of the engine unit 11.
  • the control device is connected to various sensors 71-77.
  • the control device controls the operation of the engine unit 11 based on signals from the various sensors 71 to 77.
  • the control device controls the fuel injection amount of the injector 54 based on signals from various sensors including the upstream oxygen sensor 76.
  • the signal of the downstream oxygen sensor 77 may be used for controlling the fuel injection amount.
  • the control device determines the purification capacity of the main catalyst 62a based on the signal from the downstream oxygen sensor 77.
  • the control device may determine the purification capacity of the main catalyst 62a based on the signal from the upstream oxygen sensor 76 and the signal from the downstream oxygen sensor 77.
  • the control device sends a signal to a display device (not shown) provided in the handle unit 5 when it is determined that the purification capacity of the main catalyst 62a has decreased below a predetermined level. Then, a warning light (not shown) of the display device is turned on. As a result, the rider can be urged to replace the main catalyst 62a. Further, the control device controls the discharge timing of the spark plug 31. Further, the control device controls energization to a starter motor (not shown), thereby controlling the start of the engine unit 11.
  • the vehicle body cover 100 includes the left catalyst cover portion 101 and the right catalyst cover portion 102.
  • the left catalyst cover portion 101 and the right catalyst cover portion 102 are plate members that are gently curved.
  • the right catalyst cover part 102 may be formed of one part or a plurality of parts. The same applies to the left catalyst cover 101.
  • the outline of the right catalyst cover portion 102 viewed in the left-right direction is formed by a front end 102a, a rear end 102b, a lower end 102c, and an upper end 102d (see FIG. 4).
  • the front end 102 a, the rear end 102 b, the lower end 102 c, and the upper end 102 d are edges of the right catalyst cover portion 102.
  • the “front end of the right catalyst cover portion” in the present invention includes a front end 102a.
  • the “rear end of the right catalyst cover portion” in the present invention includes the rear end 102b. As shown in FIG.
  • the upper end 102d of the right catalyst cover portion 102 is along the front-rear direction. More specifically, when viewed in the left-right direction, the upper end 102d is inclined in the up-down direction with respect to the front-rear direction. When viewed in the left-right direction, the upper end 102d is inclined so as to go downward as it goes forward. Since the upper end 102d is inclined as described above, the “front end of the right catalyst cover portion” in the present invention may include both the front end 102a and the upper end 102d. Note that the upper end 102d may be substantially parallel to the front-rear direction when viewed in the left-right direction.
  • the upper end 102d may be inclined so as to go upward as it goes forward as viewed in the left-right direction.
  • the “rear end of the right catalyst cover portion” in the present invention may include both the rear end 102b and the upper end 102d.
  • the lower end 102c of the right catalyst cover portion 102 is along the front-rear direction.
  • the lower end 102c is substantially parallel to the front-rear direction.
  • the lower end 102c may be inclined in the vertical direction with respect to the front-rear direction when viewed in the left-right direction.
  • the lower end 102c may be inclined so as to go upward as it goes forward.
  • the “front end of the right catalyst cover portion” in the present invention may include both the front end 102a and the lower end 102c.
  • the lower end 102c when viewed in the left-right direction, the lower end 102c may be inclined so as to go downward as it goes forward.
  • the “rear end of the right catalyst cover portion” in the present invention may include both the rear end 102b and the lower end 102c.
  • the lower part of the right catalyst cover part 102 is closer to the center C0 in the left-right direction of the front wheel part 2 than the upper part of the right catalyst cover part 102.
  • the right catalyst cover portion 102 is curved such that the lower portion is closer to the center C0 in the left-right direction of the front wheel portion 2 than the upper portion.
  • the front end 102 a and the rear end 102 b of the right catalyst cover portion 102 are closer to the center C0 in the left-right direction of the front wheel portion 2 than the middle portion in the front-rear direction of the right catalyst cover portion 102.
  • the right catalyst cover portion 102 is curved so that the front end 101a and the rear end 101b are closer to the center C0 in the left-right direction of the front wheel portion 2 than the middle portion in the front-rear direction.
  • the left catalyst cover portion 101 as viewed in the left-right direction has a front end 101a, a rear end 101b, a lower end 101c, and an upper end 101d.
  • the left catalyst cover portion 101 is formed substantially symmetrically with the right catalyst cover portion 102. Therefore, the description of the shape of the right catalyst cover portion 102 described above also applies to the left catalyst cover portion 101 with the left and right sides reversed. A description of the shape of the left catalyst cover 101 is omitted.
  • the front end 102a of the right catalyst cover portion 102 is closer to the center C0 in the left-right direction of the front wheel portion 2 than the rear end 102b of the right catalyst cover portion 102.
  • An arbitrary horizontal plane passing through the catalyst unit 62 is defined as a horizontal plane H1.
  • a distance between the rear end 101b of the left catalyst cover portion 101 and the rear end 102b of the right catalyst cover portion 102 in the horizontal plane H1 is a distance D1.
  • a distance between the front end 101a of the left catalyst cover portion 101 and the front end 102a of the right catalyst cover portion 102 in the horizontal plane H1 is a distance D2.
  • the separation distance D1 is larger than the separation distance D2.
  • the separation distance D1 is greater than the separation distance D2 regardless of which position of the catalyst unit 62 the horizontal plane H1 passes.
  • the separation distance D1 may be larger than the separation distance D2 only when the horizontal plane H1 passes through a part of the catalyst portion 62.
  • the distance D1 does not have to be larger than the distance D2 regardless of the position of the catalyst unit 62 where the horizontal plane H1 passes. That is, the separation distance D1 may be the same as or smaller than the separation distance D2.
  • the rear end 102 b of the right catalyst cover portion 102 may be closer to the center in the left-right direction of the front wheel portion 2 than the front end 102 a of the right catalyst cover portion 102.
  • the right catalyst cover portion 102 covers the engine body 20 so that the rear portion of the crankcase portion 20a of the engine body 20 is exposed when viewed from the right side.
  • the left catalyst cover portion 101 covers the engine body 20 so that the rear portion of the crankcase portion 20a of the engine body 20 is exposed when viewed from the left.
  • a plane that passes through the leftmost end of the left catalyst cover portion 101 and is orthogonal to the left-right direction is defined as a plane Sc1.
  • the plane Sc1 is located to the right of the plane Se3.
  • the plane Se3 is a plane that passes through the leftmost end of the engine body 20 and is orthogonal to the left-right direction.
  • a plane passing through the rightmost end of the right catalyst cover portion 102 and orthogonal to the left-right direction is defined as a plane Sc2.
  • the plane Sc2 is located to the left of the plane Se4.
  • the plane Se4 is a plane that passes through the leftmost end of the engine body 20 and is orthogonal to the left-right direction.
  • the maximum value of the distance in the left-right direction between the front end 101a of the left catalyst cover 101 and the front end 102a of the right catalyst cover 102 is defined as a distance Dmax.
  • the separation distance Dmax is larger than the lateral width of the engine body 20.
  • the width of the engine body 20 in the left-right direction is a distance in the left-right direction between the plane Se3 and the plane Se4.
  • the lateral width of the engine body 20 is the lateral width of the engine unit 11.
  • the right catalyst cover portion 102 covers a part of the catalyst portion 62 when viewed from the right side.
  • the right catalyst cover portion 102 covers the catalyst portion 62 so that the upper end portion of the front portion of the catalyst portion 62 is exposed when viewed from the right side.
  • a line segment arranged at the lowest position among line segments connecting the points on the contour line of the catalyst part 62 and the points on the contour line of the front wheel part 2 when viewed in the left-right direction is defined as a line segment Lc1.
  • the line segment arranged at the uppermost position among the line segments connecting the points on the contour line of the catalyst part 62 and the points on the contour line of the front wheel part 2 when viewed in the left-right direction is defined as a line segment Lc2.
  • a part of the front end 102a of the right catalyst cover portion 102 is disposed in a rectangular region having two lines Lc1 and Lc2.
  • a part of the front end 102a of the right catalyst cover portion 102 is disposed in a rectangular region having two sides of the line segment Lc1 and the line segment Lc2, and is also formed on the catalyst unit 62 and the front wheel unit 2. Do not overlap. That is, when viewed from the right, a part of the front end 102 a of the right catalyst cover portion 102 is disposed between the catalyst portion 62 and the front wheel portion 2.
  • a part of the front end 102 a of the right catalyst cover portion 102 is disposed in front of the catalyst portion 62 as viewed from the right. When viewed from the right, a part of the catalyst part 62 is disposed behind the front end 102a of the right catalyst cover part 102.
  • the right catalyst cover portion 102 covers a part of the catalyst portion 62 when viewed from the right side.
  • the right catalyst cover portion 202 may cover the entire catalyst portion 62 as viewed from the right direction, for example, like the right catalyst cover portion 202 shown in FIG.
  • the entire catalyst portion 62 is disposed behind the front end 202a of the right catalyst cover portion 202 when viewed from the right.
  • a part of the front end 202a of the right catalyst cover portion 202 is disposed between the catalyst portion 62 and the front wheel portion 2 when viewed from the right side.
  • at least a part of the catalyst part 62 is covered with the right catalyst cover parts 102 and 202 when viewed from the right side.
  • it is preferable that at least a part of the catalyst portion 62 is disposed behind the front ends 102a, 202a of the right catalyst cover portions 102, 202.
  • the left catalyst cover part 101 covers a part of the catalyst part 62 as viewed from the left.
  • a part of the front end 101a of the left catalyst cover portion 101 is disposed between the catalyst portion 62 and the front wheel portion 2 when viewed from the left.
  • the other positional relationship between the left catalyst cover portion 101 and the catalyst portion 62 is the same as the positional relationship between the right catalyst cover portion 102 and the catalyst portion 62 described above. However, the left-right direction is reversed. Therefore, the description is omitted.
  • the catalyst portion 62 when viewed from the front, the catalyst portion 62 is disposed between the front end 101a of the left catalyst cover portion 101 and the front end 102a of the right catalyst cover portion 102. Assume that the vehicle body cover 100, the engine unit 11, and the exhaust device 60 are viewed from the front. At this time, the entire catalyst portion 62 is exposed between the front end 101 a of the left catalyst cover portion 101 and the front end 102 a of the right catalyst cover portion 102. Further, when viewed from the front, the right end of the catalyst portion 62 is located to the right of the right end of the front wheel portion 2. Assume that the vehicle body cover 100, the engine unit 11, the exhaust device 60, and the front wheel portion 2 are viewed from the front. At this time, a part of the catalyst portion 62 is exposed between the front end 102 a of the right catalyst cover portion 102 and the right end of the front wheel portion 2.
  • the following configuration may be used. That is, only a part of the catalyst part 62 is exposed between the front end 101 a of the left catalyst cover part 101 and the front end 102 a of the right catalyst cover part 102. However, it is preferable that more than half of the catalyst part 62 is exposed.
  • the right catalyst cover portion 102 may cover a part of the catalyst portion 62.
  • a part of the radiator 41 of the engine unit 11 may cover a part of the catalyst unit 62 as viewed from the front. Note that more than half of the catalyst part 62 is exposed means that more than half of the surface area of the catalyst part 62 viewed from the front is exposed.
  • the motorcycle 1 of the present embodiment described above has the following characteristics. At least a part of the catalyst portion 62 is disposed between the engine body 20 and the front wheel portion 2 when viewed in the left-right direction. Therefore, the path length from the combustion chamber 30 to the catalyst unit 62 of the engine body 20 is short. Therefore, higher temperature exhaust gas flows into the catalyst unit 62. Therefore, when the engine unit 11 is cold started, the time until the main catalyst 62a is activated from the inactive state can be shortened.
  • the length of the front wheel portion 2 in the left-right direction is smaller than the maximum length of the engine unit 11 in the left-right direction.
  • the front wheel portion 2 is disposed in front of the engine unit 11 when viewed in the left-right direction. While the motorcycle 1 is traveling, air flows from the front end of the front wheel portion 2 to the left and right of the front wheel portion 2 and spreads backward. Using this air flow, the catalyst unit 62 and the vehicle body cover 100 are arranged as follows.
  • the left catalyst cover portion 101 included in the vehicle body cover 100 covers at least a part of the catalyst portion 62 when viewed from the left.
  • the right catalyst cover portion 102 of the vehicle body cover 100 covers at least a part of the catalyst portion 62 when viewed from the right side.
  • the catalyst unit 62 is disposed between the catalyst portion 62 and the front wheel portion 2 when viewed from the left.
  • at least a part of the front end 102a of the right catalyst cover portion 102 is disposed between the catalyst portion 62 and the front wheel portion 2 when viewed from the right side.
  • the distance Dmax is the maximum value of the separation distance in the left-right direction between the front end 101a of the left catalyst cover 101 and the front end 102a of the right catalyst cover 102.
  • the vehicle body cover 100 is formed such that the separation distance Dmax is smaller than the maximum length of the engine body 20 in the left-right direction.
  • the distance in the left-right direction between the front end 101a of the left catalyst cover 101 and the front end 102a of the right catalyst cover 102 is relatively short. Therefore, it is possible to suppress the flow of air generated by the traveling of the motorcycle 1 between the front end 101a of the left catalyst cover portion 101 and the front end 102a of the right catalyst cover portion 102. Therefore, it can suppress more that the catalyst part 62 receives the flow of air directly from the front.
  • at least a part of the catalyst portion 62 is disposed between the engine body 20 and the front wheel portion 2 when viewed in the left-right direction. Further, the catalyst part 62 is disposed below the upper end of the front wheel part 2. Therefore, it is possible to further suppress the catalyst unit 62 from directly receiving the air flow by the front wheel unit 2 while the motorcycle 1 is traveling.
  • the catalyst unit 62 can be prevented from receiving an air flow directly while the motorcycle 1 is traveling, the temperature drop of the catalyst unit 62 during traveling can be suppressed. Further, when the vehicle body cover 100, the engine main body 20, and the exhaust device 60 are viewed from the front, between the front end 101 a of the left catalyst cover portion 101 and the front end 102 a of the right catalyst cover portion 102, more than half of the catalyst portion 62. Is exposed. By forming the exhaust device 60 and the vehicle body cover 100 in this manner, the catalyst unit 62 can receive an appropriate amount of air while the motorcycle 1 is traveling.
  • the motorcycle 1 of the present embodiment can shorten the time until the catalyst unit 62 is activated from the inactive state, and also affects the heat effect on the parts arranged around the catalyst unit 62 and the main catalyst 62a. Deterioration can be suppressed.
  • the parts disposed around the catalyst unit 62 include the vehicle body cover 100.
  • the catalyst part 62 is between the front end 101 a of the left catalyst cover part 101 and the left end of the front wheel part 2. Exposed.
  • the vehicle body cover 100, the engine body 20, the exhaust device 60, and the front wheel portion 2 are viewed from the front, at least one of the catalyst portions 62 is between the front end 102a of the right catalyst cover portion 102 and the right end of the front wheel portion 2. Part is exposed.
  • the center of the upstream end and the center of the downstream end of the catalyst portion 62 are both located to the right of the center C0 in the left-right direction of the front wheel portion 2. That is, when viewed in the front-rear direction, the catalyst unit 62 is disposed close to the right portion of the motorcycle 1.
  • the central axis C1 of the catalyst part 62 is arranged directly behind the center C0 in the left-right direction of the front wheel part 2. Compared to this case, it is easy to realize a configuration in which a part of the catalyst portion 62 is exposed between the left catalyst cover portion 101 or the right catalyst cover portion 102 and the front wheel portion 2. Therefore, the heat of the catalyst unit 62 is more easily radiated toward the front.
  • the catalyst unit 62 is arranged so that the flow direction of the exhaust gas flowing inside is in a direction along the vertical direction. Therefore, the length in the vertical direction of the catalyst unit 62 is longer than that in the case where the catalyst unit 62 is arranged so that the flow direction of the exhaust gas flowing in the interior is a direction along the front-rear direction.
  • the vertical length of the catalyst part 62 is long, the surface area of the catalyst part 62 as viewed from the front is large. Therefore, the heat of the catalyst unit 62 is more easily radiated toward the front.
  • more than half of the catalyst portion 62 is exposed between the front end 101a of the left catalyst cover portion 101 and the front end 102a of the right catalyst cover portion 102.
  • the catalyst part 62 of this embodiment is arrange
  • the engine body 20 is disposed such that the cylinder axis Cy is along the vertical direction.
  • the engine body 20 is long in the direction of the cylinder axis Cy. Therefore, the length of the engine body 20 in the vertical direction is longer than that in the case where the engine body 20 is arranged so that the cylinder axis Cy is along the front-rear direction.
  • the surface area of the engine body 20 viewed from the front is large. Therefore, the heat of the combustion chamber 30 is more easily radiated from the front surface of the engine body 20 toward the front.
  • the catalyst part is disposed in front of the engine body, hot air is likely to be trapped between the catalyst part and the ground. That is, hot air is easily trapped around the catalyst portion.
  • the heat of the combustion chamber 30 is easily radiated forward from the front surface of the engine body 20. There is no large shield such as the ground in front of the engine body 20.
  • hot air is less likely to accumulate between the engine body 20 and the ground. Therefore, compared with the case where the engine body 20 is arranged so that the cylinder axis Cy is along the front-rear direction, hot air is less likely to stay around the catalyst portion 62. Therefore, it is possible to further suppress the thermal influence on the parts arranged around the catalyst portion 62 and the deterioration of the main catalyst 62a.
  • the motorcycle tends to increase in size in the front-rear direction.
  • the engine body 20 of the present embodiment is arranged such that the cylinder axis Cy is along the vertical direction. Therefore, the length of the engine body 20 in the front-rear direction is short. Therefore, even if a large space is secured between the front wheel portion 2 and the engine main body 20, an increase in the motorcycle 1 can be suppressed. Therefore, even if the catalyst unit 62 is disposed in front of the engine body 20, the size increase in the front-rear direction of the motorcycle 1 can be suppressed.
  • the catalyst unit 62 is disposed in front of the crank axis Cr. Therefore, the path length from the combustion chamber 30 to the catalyst unit 62 can be further shortened. Therefore, higher temperature exhaust gas flows into the catalyst unit 62. Therefore, when the engine unit 11 is cold started, the time until the main catalyst 62a is activated from the inactive state can be further shortened.
  • At least a part of the catalyst part 62 is disposed in front of the crankcase part 20a.
  • the catalyst part 62 is arranged in front of the cylinder part 20b and is not arranged in front of the crankcase part 20a.
  • the path length Da1 from the combustion chamber 30 to the catalyst unit 62 is too short. If the path length Da1 from the combustion chamber 30 to the catalyst unit 62 is too short, the temperature of the exhaust gas flowing into the main catalyst 62a may become too high. As a result, the main catalyst 62a may be deteriorated due to overheating. Therefore, at least a part of the catalyst portion 62 is disposed in front of the crankcase portion 20a, so that deterioration due to overheating of the main catalyst 62a can be suppressed.
  • the path length from the combustion chamber 30 to the catalyst unit 62 is shorter than when the entire catalyst unit 62 is disposed behind the straight line La2 when viewed in the left-right direction. Therefore, the temperature of the exhaust gas flowing into the main catalyst 62a becomes high. Thereby, when the engine unit 11 is cold started, the time until the main catalyst 62a is activated from the inactive state can be further shortened.
  • the lower end of the catalyst unit 62 may be positioned significantly below the lower end of the engine body 20.
  • the motorcycle 1 increases in size in the vertical direction in order to secure a separation distance between the catalyst unit 62 and the ground. Therefore, when viewed in the left-right direction, at least a part of the catalyst portion 62 is disposed in front of the straight line La2, so that the size of the motorcycle 1 in the vertical direction can be suppressed.
  • the separation distance D1 is larger than the separation distance D2 in the horizontal plane H1 passing through the catalyst portion 62.
  • the separation distance D1 is a separation distance in the left-right direction between the rear end 101b of the left catalyst cover portion 101 and the rear end 102b of the right catalyst cover portion 102 in the horizontal plane H1.
  • the separation distance D2 is a separation distance in the left-right direction between the front end 101a of the left catalyst cover portion 101 and the front end 102a of the right catalyst cover portion 102 in the horizontal plane H1. Since the separation distance D1 is large, it is easy to secure a gap between the member covered by the rear portion of the left catalyst cover portion 101 and the rear end 101b of the left catalyst cover portion 101.
  • the hot air between the left catalyst cover and the catalyst part 62 can be easily discharged rearward from the rear end 101b of the left catalyst cover part 101. Since the separation distance D1 is large, it is easy to secure a gap between the member covered by the rear portion of the right catalyst cover portion 102 and the rear end 102b of the right catalyst cover portion 102. Therefore, the hot air between the right catalyst cover portion 102 and the catalyst portion 62 can be easily discharged rearward from the rear end 102b of the right catalyst cover portion 102. For these reasons, even if the traveling of the motorcycle 1 is stopped, it is difficult for hot air to accumulate around the catalyst unit 62. Therefore, it is possible to further suppress the thermal influence on the parts arranged around the catalyst portion 62 and the deterioration of the main catalyst 62a.
  • FIG. 12 is a right side view of a part of the engine unit according to the first modification of the embodiment.
  • the same components as those in the above embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
  • the engine unit of Modification 1 has a downstream sub-catalyst 47D and an upstream sub-catalyst 47U.
  • the upstream sub-catalyst 47U and the downstream sub-catalyst 47D may be collectively referred to as a sub-catalyst 47 (not shown).
  • the upstream sub-catalyst 47U is disposed upstream of the catalyst unit 62.
  • the upstream sub catalyst 47U is disposed in the upstream exhaust passage portion 61.
  • the upstream sub-catalyst 47U is disposed in at least one of the plurality of independent exhaust passage portions 64.
  • the upstream sub-catalyst 47U may be disposed in the upstream collective exhaust passage portion 65. Further, the upstream sub-catalyst 47U may be disposed in at least one of the plurality of internal exhaust passage portions 34.
  • the upstream sub catalyst 47U is disposed upstream of the upstream oxygen sensor 76.
  • the downstream sub-catalyst 47D is disposed downstream of the catalyst unit 62.
  • the downstream sub-catalyst 47D is disposed in the downstream exhaust passage portion 63.
  • the downstream sub-catalyst 47D is disposed in the downstream collective exhaust passage section 66. Note that the downstream sub-catalyst 47D may be disposed in the muffler portion 67.
  • the downstream sub-catalyst 47 ⁇ / b> D is disposed downstream of the downstream oxygen sensor 77.
  • the sub catalyst 47 purifies the exhaust gas.
  • the sub catalyst 47 has the same catalyst material as the main catalyst 62a.
  • the sub catalyst 47 may have a porous structure like the main catalyst 62a.
  • the sub catalyst 47 may not have a porous structure.
  • An example of the subcatalyst 47 having no porous structure will be given.
  • the sub-catalyst 47 is composed only of the catalyst material attached to the inner surface of the downstream exhaust passage portion 63. In this case, the base material to which the catalyst material of the sub catalyst 47 is attached is the downstream exhaust passage portion 63. Another example of the sub-catalyst 47 having no porous structure will be given.
  • the sub-catalyst 47 has a configuration in which a catalytic substance is attached to a plate-like base material.
  • the cross-sectional shape orthogonal to the flow direction of the exhaust gas of the plate-like substrate is, for example, a circular shape, a C shape, or an S shape.
  • the main catalyst 62a purifies the exhaust gas most in the plurality of exhaust passages 69. That is, the main catalyst 62 a purifies the exhaust gas discharged from the combustion chamber 30 in the plurality of exhaust passages 69 rather than the sub catalyst 47. In other words, the sub catalyst 47 has a lower contribution to purify the exhaust gas than the main catalyst 62a.
  • the respective purification contributions of the main catalyst 62a, the upstream sub-catalyst 47U, and the downstream sub-catalyst 47D can be measured by the following method.
  • the engine unit of the first modification is operated, and the concentration of harmful substances contained in the exhaust gas discharged from the atmospheric discharge port 67a in the warm-up state is measured.
  • the warm-up state refers to a state where the temperature of the engine body 20 is sufficiently warmed.
  • the exhaust gas measurement method shall be in accordance with European regulations.
  • the downstream sub-catalyst 47D is removed from the engine unit of the first modification, and only the base material of the downstream sub-catalyst 47D is disposed instead.
  • the engine unit in this state is referred to as a measurement engine unit A.
  • the measurement engine unit A is operated to measure the concentration of harmful substances contained in the exhaust gas discharged from the atmospheric discharge port 67a in the warm-up state.
  • the downstream sub-catalyst 47D may have a configuration in which a catalytic substance is directly attached to the inner surface of the downstream exhaust passage portion 63. In this case, “disposing only the base material of the downstream sub-catalyst 47 ⁇ / b> D” means that the catalytic substance is not attached to the inner surface of the downstream exhaust passage portion 63.
  • the main catalyst 62a is removed from the measurement engine unit A, and only the base material of the main catalyst 62a is disposed instead.
  • the engine unit in this state is referred to as a measurement engine unit B.
  • the measurement engine unit B is operated to measure the concentration of harmful substances contained in the exhaust gas discharged from the atmospheric discharge port 67a in the warm-up state.
  • the upstream sub-catalyst 47U is removed from the measurement engine unit B, and instead, only the base material of the upstream sub-catalyst 47U is disposed.
  • the engine unit in this state is referred to as a measurement engine unit C.
  • the measurement engine unit C is operated to measure the concentration of harmful substances contained in the exhaust gas discharged from the atmospheric discharge port 67a in the warm-up state.
  • the engine unit C for measurement does not have the main catalyst 62a and the sub catalyst 47.
  • the measurement engine unit B includes an upstream sub-catalyst 47U and does not include the main catalyst 62a and the downstream sub-catalyst 47D.
  • the measurement engine unit A has a main catalyst 62a and an upstream sub catalyst 47U, and does not have a downstream sub catalyst 47D. Therefore, the degree of contribution of the purification of the downstream sub-catalyst 47D is calculated from the difference between the measurement result of the engine unit of Modification 1 and the measurement result of the measurement engine unit A. Further, from the difference between the measurement result of the measurement engine unit A and the measurement result of the measurement engine unit B, the contribution of purification of the main catalyst 62a is calculated. Further, from the difference between the measurement result of the measurement engine unit B and the measurement result of the measurement engine unit C, the contribution of the purification of the upstream sub-catalyst 47U is calculated.
  • the main catalyst 62a most purifies the exhaust gas in the plurality of exhaust passages 69. If this condition is satisfied, the purification capacity of the sub catalyst 47 may be smaller or larger than the purification capacity of the main catalyst 62a. Note that the purification capability of the sub-catalyst 47 is smaller than the purification capability of the main catalyst 62a means the following state. That is, the exhaust gas discharged from the atmospheric discharge port 67a when only the sub-catalyst is provided is more purified than the exhaust gas discharged from the atmospheric discharge port 67a when only the main catalyst 62a is provided.
  • the upstream catalyst deteriorates faster than the downstream catalyst. For this reason, when the usage time becomes longer, the magnitude relationship between the contributions of the purification of the main catalyst 62a and the downstream sub-catalyst 47D may be reversed. Therefore, the main catalyst 62a has a higher contribution of purification than the downstream sub-catalyst 47D in the following state. That is, when the travel distance has not reached a predetermined distance (for example, 1000 km), the main catalyst 62a is in a state where the contribution of purification is higher than that of the downstream sub-catalyst 47D.
  • a predetermined distance for example, 1000 km
  • the volume of the main catalyst 62a is preferably larger than the volume of the sub catalyst 47.
  • the surface area of the main catalyst 62 a is preferably larger than the surface area of the sub catalyst 47.
  • the amount of the noble metal of the main catalyst 62a is preferably larger than the amount of the noble metal of the sub catalyst.
  • the engine unit may include only one of the upstream sub-catalyst 47U and the downstream sub-catalyst 47D.
  • the contribution degree of purification can be calculated by a method applying the above-described method.
  • the main catalyst 62a can be made smaller while maintaining the exhaust purification performance compared to the case where the downstream sub-catalyst 47D is not provided. Since the catalyst part 62 becomes small, the freedom degree of the arrangement position of the catalyst part 62 becomes high. Therefore, the catalyst unit 62 can be arranged at a position where the path length from the combustion chamber 30 to the catalyst unit 62 is further shortened. Thereby, when the engine unit 11 is cold started, the time until the main catalyst 62a is activated from the inactive state can be further shortened.
  • the upstream sub-catalyst 47U By providing the upstream sub-catalyst 47U, it is possible to reduce the main catalyst 62a while maintaining the exhaust purification performance compared to the case where the upstream sub-catalyst 47U is not provided. Since the catalyst part 62 becomes small, the freedom degree of the arrangement position of the catalyst part 62 becomes high. Therefore, the catalyst unit 62 can be arranged at a position where the path length from the combustion chamber 30 to the catalyst unit 62 is further shortened. Thereby, when the engine unit 11 is cold started, the time until the main catalyst 62a is activated from the inactive state can be further shortened.
  • FIG. 13 is a right side view of a part of the engine unit of Modification 2 of the above embodiment.
  • the same components as those in the above embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
  • the engine unit of Modification 2 has a turbocharger 230.
  • the turbocharger 230 has a turbine wheel 230a, a compressor wheel 230b, and a connecting shaft 230c.
  • the turbine wheel 230a is connected to the compressor wheel 230b via a connecting shaft 230c.
  • the turbine wheel 230a is disposed in the upstream collective exhaust passage portion 265.
  • the upstream collective exhaust passage portion 265 is connected to the downstream ends of the three independent exhaust passage portions 264.
  • the upstream collective exhaust passage portion 265 and the independent exhaust passage portion 264 are provided in place of the upstream collective exhaust passage portion 65 and the independent exhaust passage portion 64 of the above embodiment.
  • the compressor wheel 230 b is disposed in the intake passage portion 252.
  • the intake passage portion 252 is provided in place of the intake passage portion 52 of the above embodiment.
  • the connecting shaft 230 c is accommodated in the center housing part 231.
  • the center housing portion 231 is connected to the upstream collective exhaust passage portion 265 and the intake passage portion 252.
  • the connecting shaft 230c is rotatably supported by the center housing portion 231.
  • the upstream collective exhaust passage portion 265 has a scroll exhaust passage portion 265s.
  • the scroll exhaust passage 265s is formed so as to surround the outer periphery of the turbine wheel 230a.
  • the intake passage portion 252 has a scroll intake passage portion 252s.
  • the scroll intake passage portion 252s is formed so as to surround the outer periphery of the compressor wheel 230b.
  • the exhaust gas in the scroll exhaust passage portion 265s is blown to the outer peripheral portion of the turbine wheel 230a.
  • the turbine wheel 230a rotates.
  • the exhaust gas blown to the outer peripheral portion of the turbine wheel 230a is discharged from the turbine wheel 230a in the direction of the central axis of the connecting shaft 230c.
  • the compressor wheel 230b rotates with the rotation of the turbine wheel 230a.
  • the compressor wheel 230b sucks air in the direction of the central axis of the connecting shaft 230c.
  • the sucked air is compressed by the compressor wheel 230b.
  • the compressed air is discharged from the outer peripheral portion of the compressor wheel 230b to the scroll intake passage portion 252s.
  • the turbocharger 230 by providing the turbocharger 230, compressed air is supplied to the combustion chamber 30. Thereby, the intake efficiency is improved. As a result, the engine output can be improved. Further, since the compressed air is supplied to the combustion chamber 30, the displacement of the engine body 20 can be reduced. Thereby, fuel consumption can be improved.
  • the scroll exhaust passage portion 265s shown in FIG. 14 is a single scroll type having only one exhaust gas inlet.
  • the scroll exhaust passage portion may be a twin scroll type having two exhaust gas inlets.
  • the case where the number of the combustion chambers 30 is two will be described as an example.
  • the twin scroll type scroll exhaust passage portion includes a first scroll passage portion and a second scroll passage portion.
  • the first scroll passage portion and the second scroll passage portion are formed in two independent exhaust passage portions 264, respectively.
  • the turbine wheel 230a is disposed in the upstream collective exhaust passage portion 265.
  • the first scroll passage portion and the second scroll passage portion are adjacent to each other in the direction of the central axis of the connecting shaft 230c.
  • the exhaust gas in the first scroll passage and the exhaust gas in the second scroll passage are sprayed on the outer peripheral portion of the turbine wheel 230a.
  • the exhaust gases discharged from the two scroll passages gather (merge) when passing through the turbine wheel 230a.
  • the path length of the independent exhaust passage portion 264 becomes longer. Therefore, the exhaust gas discharged from one combustion chamber 30 can be prevented from being disturbed by the pressure of the exhaust gas discharged from one combustion chamber 30. That is, the flow rate and pressure of exhaust gas can be prevented from decreasing. Therefore, a reduction in engine output can be prevented.
  • the fall of the rotational speed of the turbine wheel 230a can be prevented by preventing the fall of the flow volume and pressure of exhaust gas. Therefore, it is possible to prevent a reduction in intake efficiency. By preventing a reduction in intake efficiency, it is possible to prevent a decrease in fuel consumption and a decrease in engine output.
  • the exhaust gas discharged from the two or more combustion chambers 30 flows in at least one of the first scroll passage portion and the second scroll passage portion.
  • the number of the combustion chambers 30 is four, only the exhaust gas discharged from the two combustion chambers 30 flows through each scroll passage portion. In this case, exhaust gas discharged from the two combustion chambers 30 is gathered between the two combustion chambers 30 and the first scroll passage portion. Similarly, exhaust gas discharged from the two combustion chambers 30 is collected between the remaining two combustion chambers 30 and the second scroll passage portion.
  • the upstream end of the exhaust passage part that collects the exhaust gas discharged from the two combustion chambers 30 may be inside the engine body 20 or outside the engine body 20.
  • the lower end 101c of the left catalyst cover 101 and the lower end 102c of the right catalyst cover 102 are separated (see FIG. 4).
  • the lower end of the left catalyst cover part 101 and the lower end of the right catalyst cover part 102 may be connected. That is, the left catalyst cover portion 101 and the right catalyst cover portion 102 may be integrated.
  • the left catalyst cover portion is a portion on the left side of the center C0 in the left-right direction of the motorcycle 1.
  • the right catalyst cover portion is a portion on the right side of the center C0 in the left-right direction of the motorcycle 1.
  • the front end 102a of the right catalyst cover portion 102 is formed by the edge of a plate-like member.
  • the front end of the right catalyst cover 102 may not be the edge of the member as long as it is a part of the outline of the right catalyst cover 102 viewed from the right.
  • the contour of the bent portion viewed from the right forms a part of the front end of the right catalyst cover portion.
  • the front edge of the plate-like member that forms the right catalyst cover part is located behind the front end of the right catalyst cover part. This modification is also applied to the front end 101a of the left catalyst cover 101.
  • crankcase 21 and the cylinder body 22 are separate bodies. However, the crankcase and the cylinder body may be integrally formed. Moreover, in the said embodiment, the cylinder body 22, the cylinder head 23, and the head cover 24 are separate bodies. However, any two or three of the cylinder body, the cylinder head, and the head cover may be integrally formed. In the above embodiment, the crankcase 21 and the oil pan 26 are separate bodies. However, the crankcase and the oil pan may be integrally formed.
  • the shape of the cross section orthogonal to the flow direction of the exhaust gas of the main catalyst 62a is a circle.
  • the cross-sectional shape of the main catalyst 62a is not limited to a circle.
  • the cross-sectional shape of the main catalyst 62a may be an oval shape that is long in the left-right direction. That is, it may be flat.
  • the cross-sectional shape of the catalyst portion 62 is preferably similar to the cross-sectional shape of the main catalyst 62a. This modification may be applied to the sub-catalyst 47 when the sub-catalyst 47 has a porous structure.
  • the length Dc1 of the catalyst part 62 is longer than the length Dc2 of the catalyst part 62.
  • the length Dc1 of the catalyst part 62 may be shorter than the length Dc2 of the catalyst part 62.
  • the length Dc1 is the length of the catalyst portion 62 in the exhaust gas flow direction.
  • the length Dc2 is the maximum length in the direction orthogonal to the flow direction of the exhaust gas in the catalyst unit 62.
  • the main catalyst 62a may have a configuration in which a plurality of pieces of catalyst are arranged close to each other. Each piece has a substrate and a catalytic material. The fact that a plurality of pieces are arranged close to each other means the following state. That is, the distance between the pieces is shorter than the length of each piece in the flow direction of the exhaust gas.
  • the composition of the multi-piece substrate may be the same or different.
  • the noble metals of the catalyst material of the multi-piece catalyst may be the same or different. This modification may be applied to the sub catalyst 47.
  • the exhaust device 60 is configured such that the catalyst unit 62 is disposed on the right side of the motorcycle 1.
  • the exhaust device 60 may be configured such that the catalyst unit 62 is disposed on the left side of the motorcycle 1.
  • the muffler part 67 is also arranged at the left part of the motorcycle 1.
  • the exhaust device 60 may be configured such that the central axis C1 of the catalyst unit 62 is disposed at the center C0 in the left-right direction of the motorcycle 1.
  • the exhaust device 60 may be configured such that the center of the upstream end and the center of the downstream end of the catalyst unit 62 are arranged on both sides of the center C0 in the left-right direction of the motorcycle 1.
  • At least a part of the outer surface of the cylindrical portion 62 b may be covered with a catalyst protector 330.
  • the part which covers the outer surface of the cylinder part 62b among the catalyst protectors 330 is set as the catalyst protector part 362c.
  • the catalyst protector part 362c is included in the catalyst part 362.
  • a part of the catalyst protector 330 may be included in the upstream collecting exhaust passage portion 65.
  • a part of the catalyst protector 330 may be included in the downstream collecting exhaust passage portion 66.
  • the catalyst protector portion 362c may be cylindrical, but may not be cylindrical.
  • the time until the main catalyst 62a is activated from the inactive state can be further shortened. Therefore, the exhaust purification performance by the main catalyst 62a can be further improved.
  • the cylindrical part 62b and the main catalyst 62a can be protected by providing the catalyst protector part 362c. Furthermore, the appearance can be improved by providing the catalyst protector portion 362c.
  • At least a part of the upstream exhaust passage 61 may be composed of multiple tubes.
  • the multiple tube is composed of an inner tube and at least one outer tube covering the inner tube.
  • the multiple tube may be a double tube 430.
  • the double tube 430 has an inner tube 430a and an outer tube 430b. Both ends of the inner tube 430a are in contact with both ends of the outer tube 430b.
  • the inner tube 430a and the outer tube 430b may contact at places other than both ends.
  • the inner tube 430a and the outer tube 430b may be in contact with each other at the bent portion.
  • the exhaust device 60 may have two muffler parts 67 for one catalyst part 62. That is, the exhaust device 60 may have two atmospheric discharge ports 67 a for one catalyst unit 62. In this case, the downstream collective exhaust passage 66 is formed in a bifurcated shape.
  • the two muffler parts 67 are arranged adjacent to each other in the vertical direction. Alternatively, the two muffler parts 67 are respectively arranged on the right part and the left part of the motorcycle 1.
  • the number of exhaust ports 34b formed in the engine body 20 and the number of combustion chambers 30 are the same. However, when a plurality of combustion chamber exhaust ports 34 a are provided for one combustion chamber 30, the number of exhaust ports 34 b may be larger than the number of combustion chambers 30.
  • the number of exhaust ports 34 b may be smaller than the number of combustion chambers 30. There may be at least one exhaust port 34b.
  • the exhaust gas discharged from the plurality of combustion chambers 30 gathers inside the engine body 20.
  • the engine body 520 includes a plurality of internal independent exhaust passage portions 534S1 and an internal collective exhaust passage portion 534S2.
  • the plurality of internal independent exhaust passage portions 534S1 are connected to the plurality of combustion chambers 30, respectively.
  • the internal collective exhaust passage portion 534S2 is connected to the downstream ends of the plurality of internal independent exhaust passage portions 534S1.
  • the internal collective exhaust passage portion 534S2 collects exhaust gas discharged from the plurality of internal independent exhaust passage portions 534S1.
  • the exhaust port 534b is formed at the downstream end of the internal collective exhaust passage portion 534S2.
  • the internal collective exhaust passage portion 534S2 is connected to the upstream end of the upstream collective exhaust passage portion 565.
  • the plurality of independent exhaust passage portions 64 are not provided. According to this modification, the path length of the passage portion through which only the exhaust gas discharged from one combustion chamber 30 passes can be shortened. Therefore, the surface area of the inner surface of the passage part from the plurality of combustion chambers 30 to the catalyst part 62 can be reduced. That is, the heat capacity of the passage portion from the plurality of combustion chambers 30 to the catalyst portion 62 can be reduced. Therefore, the temperature of the exhaust gas flowing into the catalyst unit 62 increases. Thereby, when the engine unit 11 is cold-started, the time until the main catalyst 62a is activated from the inactive state can be shortened. Therefore, the exhaust purification performance by the main catalyst 62a can be improved.
  • the engine unit 11 may be configured such that the exhaust gas is cooled with cooling water between the combustion chamber 30 and the catalyst unit 62. That is, the engine unit 11 may have an exhaust gas cooling passage portion through which cooling water for cooling the exhaust gas flows.
  • the exhaust gas cooling passage part 630 may be formed on an outer peripheral part of at least a part of the upstream collecting exhaust passage part 65.
  • at least a part of the exhaust gas cooling passage part 630 may be formed on at least a part of the outer periphery of each of the plurality of independent exhaust passage parts 64.
  • the exhaust gas cooling passage part may be formed on at least a part of the outer peripheral part of each of the plurality of internal exhaust passage parts 34.
  • the cooling water flowing through the exhaust gas cooling passage may be the same as or different from the cooling water that cools the engine body 20.
  • the exhaust gas may be cooled by using a cooling medium other than water instead of the cooling water.
  • the predetermined timing is determined based on, for example, the elapsed time, the total number of rotations of the crankshaft 27, or the temperature of the exhaust gas.
  • the exhaust gas cooling passage portion can be reduced in size.
  • the exhaust gas cooling passage portion can be reduced in size as compared with the case where the exhaust gas cooling passage portion is not provided in the upstream collective exhaust passage portion 65 but provided in each outer peripheral portion of the plurality of internal exhaust passage portions 34. Therefore, it is possible to suppress an increase in size of the vehicle in the vertical direction and the front-rear direction.
  • an exhaust gas cooling passage portion may be applied to the modification of FIG. At least a part of the exhaust gas cooling passage part may be formed on an outer peripheral part of at least a part of the upstream collecting exhaust passage part 565. Further, at least a part of the exhaust gas cooling passage part may be formed on at least a part of the outer peripheral part of the internal collective exhaust passage part 534S2. Further, at least a part of the exhaust gas cooling passage part may be formed on at least a part of the outer peripheral part of each of the plurality of internal independent exhaust passage parts 534S1. According to this modification, since the exhaust gas is cooled by the cooling water, it is possible to prevent the temperature of the exhaust gas flowing into the catalyst unit 62 from becoming too high.
  • the exhaust purification performance by the main catalyst 62a can be further improved.
  • the exhaust gas cooling passage part is formed on at least a part of the outer peripheral part of the internal collective exhaust passage part 534S2, the following effects are obtained.
  • the exhaust gas cooling passage portion can be reduced in size. Therefore, the engine body can be prevented from being enlarged in the vertical direction and the front-rear direction. As a result, it is possible to suppress an increase in the size of the vehicle in the vertical direction and the front-rear direction.
  • the combustion chamber 30 may have a configuration including a main combustion chamber and a sub-combustion chamber connected to the main combustion chamber.
  • a combination of the main combustion chamber and the sub-combustion chamber corresponds to the “combustion chamber” in the present invention.
  • the engine body 20 of the above embodiment has three combustion chambers 30.
  • the number of the combustion chambers 30 included in the engine body 20 may be two or four or more.
  • the number of combustion chambers 30 included in the engine body 20 may be one. That is, the engine unit of the saddle riding type vehicle to which the present invention is applied may be a single cylinder engine.
  • the exhaust device 60 includes a plurality of independent exhaust passage portions, two upstream collective exhaust passage portions, two catalyst portions, and two downstream exhaust passage portions.
  • the first upstream collective exhaust passage unit collects the exhaust gas discharged from the two combustion chambers 30 on the right side.
  • the second upstream collective exhaust passage unit collects the exhaust gas discharged from the two left combustion chambers 30.
  • the first catalyst portion is connected to the downstream end of the first upstream collective exhaust passage portion and the upstream end of the first downstream exhaust passage portion.
  • the first catalyst portion is connected to the downstream end of the second upstream collective exhaust passage portion and the upstream end of the second downstream exhaust passage portion.
  • the first downstream exhaust passage portion and the second downstream exhaust passage portion each have an atmospheric discharge port.
  • the passage portion and the first catalyst portion which are a combination of the two independent exhaust passage portions and the first upstream collective exhaust passage portion, correspond to the upstream exhaust passage portion and the catalyst portion in the present invention.
  • the passage portion and the second catalyst portion which are a combination of the remaining two independent exhaust passage portions and the second upstream collective exhaust passage portion, correspond to the upstream exhaust passage portion and the catalyst portion in the present invention.
  • the engine body 20 may be a so-called V-type engine.
  • a V-type four-cylinder engine has four combustion chambers arranged two at the front and the rear.
  • the combustion chamber provided in the front part of the V-type engine is referred to as a front combustion chamber.
  • the plurality of front combustion chambers are adjacent to each other in the left-right direction.
  • a combustion chamber provided at the rear of the V-type engine is referred to as a post-combustion chamber.
  • the plurality of rear combustion chambers are adjacent to each other in the left-right direction. Let the cylinder hole which divides a part of front combustion chamber be a front cylinder hole.
  • the direction of the central axis of the front cylinder hole is the same as the direction of the cylinder axis Cy.
  • the front combustion chamber communicates with the internal exhaust passage portion 34, the upstream exhaust passage portion 61, the catalyst portion 62, and the downstream exhaust passage portion 63.
  • the pre-combustion chamber is included in the “plurality of combustion chambers” in the present invention.
  • the post-combustion chamber is not included in the “plurality of combustion chambers” in the present invention.
  • the exhaust gas discharged from the rear combustion chamber may join with the exhaust gas discharged from the front combustion chamber.
  • the downstream end of the exhaust passage portion communicating with the rear combustion chamber may be connected to the upstream collective exhaust passage portion 65.
  • the exhaust gas discharged from the post-combustion chamber is purified by the main catalyst 62a.
  • the downstream end of the exhaust passage portion communicating with the post-combustion chamber may be connected to the downstream collective exhaust passage portion 66.
  • a catalyst for purifying the exhaust gas discharged from the post-combustion chamber is provided separately from the main catalyst 62a.
  • the exhaust gas discharged from the rear combustion chamber does not have to merge with the exhaust gas discharged from the front combustion chamber.
  • a catalyst for purifying the exhaust gas discharged from the post-combustion chamber is provided separately from the main catalyst 62a.
  • the tilt angle ⁇ cy with respect to the vertical direction of the cylinder axis Cy viewed in the left-right direction is 0 degree or more and 45 degrees or less. However, the inclination angle ⁇ cy may be larger than 45 degrees. The inclination angle ⁇ cy is 90 degrees or less. That is, the cylinder axis Cy may be along the front-rear direction when viewed in the left-right direction.
  • the cylinder axis Cy inclines so as to go forward as it goes upward.
  • the cylinder axis Cy may be inclined so as to go backward as it goes upward. That is, the cylinder part 20b may be inclined backward.
  • the positions of the downstream ends of the plurality of independent exhaust passage portions 64 are substantially the same with respect to the flow direction of the exhaust gas in the upstream collective exhaust passage portion 65.
  • the downstream end of the independent exhaust passage portion 64 may be located downstream of the downstream end of another independent exhaust passage portion 64 in the exhaust gas flow direction of the upstream collective exhaust passage portion 65.
  • the upstream oxygen sensor 76 is preferably disposed downstream of the downstream ends of all the independent exhaust passage portions 64.
  • the engine unit 11 may include a secondary air supply mechanism that supplies air to the exhaust path 69.
  • a known configuration is adopted as a specific configuration of the secondary air supply mechanism.
  • the secondary air supply mechanism may be configured to forcibly supply air to the exhaust path 69 by an air pump. Further, the secondary air supply mechanism may be configured to draw air into the exhaust path 69 by the negative pressure of the exhaust path 69. In the latter case, the secondary air supply mechanism includes a reed valve that opens and closes according to a change in pressure in the exhaust passage 69.
  • the upstream oxygen sensor 76 may be provided either upstream or downstream of the location where air is supplied.
  • the engine unit of the saddle riding type vehicle to which the present invention is applied may be an air-cooled engine.
  • the engine unit of the saddle riding type vehicle to which the present invention is applied may be a natural air cooling type or a forced air cooling type.
  • the application target of the present invention is not limited to motorcycles.
  • the present invention may be applied to lean vehicles other than motorcycles.
  • a lean vehicle is a vehicle having a vehicle body frame that leans to the right of the vehicle when turning right and leans to the left of the vehicle when turning left.
  • the present invention may be applied to a straddle-type vehicle other than a motorcycle.
  • the saddle riding type vehicle refers to all vehicles that ride in a state in which an occupant straddles a saddle.
  • the saddle riding type vehicle to which the present invention is applied includes a motorcycle, a tricycle, a four-wheel buggy (ATV: All Terrain Vehicle) and the like.
  • the front wheel portion in the present invention may include a plurality of front wheels.
  • the rear wheel portion in the present invention may include a plurality of rear wheels.
  • the length in the left-right direction of the front wheel portion including a plurality of front wheels means a distance in the left-right direction between the leftmost end of the leftmost front wheel and the rightmost end of the rightmost front wheel.
  • Japanese Patent Application No. 2015-077744 which is one of the basic applications of the present application, is referred to as basic application 1.
  • the water cooling device 40 of the present specification corresponds to the water cooling unit 40 of the basic application 1.
  • the crankcase 21 in the present specification corresponds to the crankcase body 25 of the basic application 1.
  • the internal intake passage portion 33 of the present specification corresponds to a structure that forms the intake passage 33 of the basic application 1.
  • the internal exhaust passage portion 34 in this specification corresponds to a structure that forms the exhaust passage 34 of the basic application 1.
  • the branch intake passage portion 51 of the present specification corresponds to a structure forming the branch intake passage 51 of the basic application 1.
  • the main catalyst 62a in this specification corresponds to the catalyst 68 of the basic application 1.
  • the independent exhaust passage portion 64 ⁇ / b> A of the present specification corresponds to a structure that forms the first exhaust passage 65 (independent exhaust passage 65) of the basic application 1.
  • the portion that is also the second exhaust passage portion 56B in the independent exhaust passage portion 64B of the present specification corresponds to a structure that forms the independent exhaust passage 66A of the basic application 1.
  • the independent exhaust passage portion 64 ⁇ / b> C in this specification corresponds to a structure that forms the third exhaust passage 67 (independent exhaust passage 67) of the basic application 1.
  • the upstream exhaust passage portion 61 of the present specification corresponds to a structure that forms the upstream exhaust passage 61 of the basic application 1.
  • the downstream exhaust passage portion 66 of the present specification corresponds to a structure that forms the downstream exhaust passage 63 of the basic application 1.
  • the upstream collective exhaust passage portion 65 collects the exhaust gas discharged from the three independent exhaust passage portions 64, it is possible to collect the exhaust gas discharged from the three independent exhaust passage portions 64. State.
  • the exhaust gases discharged from the three independent exhaust passage portions 64 do not necessarily have to be mixed. As described above, the timings of the combustion strokes in the three combustion chambers 30 are different. Therefore, the exhaust gases discharged from the three combustion chambers 30 may not be mixed.
  • the “end” of a part represents the tip of the part or a part that forms the outline of the part when viewed from a certain direction.
  • the “end part” of a part refers to the part of the “end” of the part and the vicinity thereof.
  • the passage portion means a wall body that surrounds the route to form the route, and the route means a space through which the object passes.
  • the exhaust passage portion means a wall body that surrounds the exhaust path and forms the exhaust path.
  • the exhaust path means a space through which exhaust passes.
  • the path length of an arbitrary part of the exhaust path 69 refers to the length of a line passing through the center of the exhaust path.
  • the path length in the expansion chamber of the muffler portion 67 is the length of the path that connects the center of the expansion chamber inlet and the center of the expansion chamber outlet in the shortest distance.
  • the inclination angle of the straight line A with respect to the B direction means the smaller angle of the angles formed by the straight line A and the straight line in the B direction.
  • the direction along the A direction is not limited to the direction parallel to the A direction.
  • the direction along the A direction includes a direction inclined with respect to the A direction in a range of ⁇ 45 °. This definition also applies when a straight line is along the A direction.
  • the A direction does not indicate a specific direction.
  • the A direction can be replaced with a horizontal direction or a front-rear direction.
  • the parts A and B are adjacent to each other along the X direction indicates the following state.
  • the parts A and B are arranged side by side on an arbitrary straight line along the X direction.
  • the parts A and B may or may not be arranged so that one straight line parallel to the X direction passes through.
  • the part A being arranged in front of the part B indicates the following state.
  • the component A is disposed in front of a plane that passes through the foremost end of the component B and is orthogonal to the front-rear direction.
  • the part A and the part B may or may not be arranged so that one straight line parallel to the front-rear direction passes through.
  • This definition also applies to directions other than the front-rear direction. This definition applies not only to parts but also to parts of parts, straight lines and planes.
  • the part A being arranged in front of the part B means a state in which the whole part A is arranged in front of a part of the front surface of the part B facing the part A.
  • the parts A and B are arranged so that one straight line parallel to the front-rear direction passes through.
  • the component B has at least a portion that overlaps the entire component A when viewed in the front-rear direction.
  • the part facing the part A on the front surface of the part B is the front end of the part B
  • the part A is arranged in front of the part B.
  • the portion of the front surface of the component B that faces the component A is not the foremost end of the component B, the component A may or may not be disposed in front of the component B.
  • the front surface of the component B is a surface that can be seen when the component B is viewed from the front.
  • the front surface of the component B may be composed of a plurality of surfaces instead of a single continuous surface.
  • the component A when the component A is disposed in front of the component B when viewed in the left-right direction, it refers to a state where the entire component A is disposed in front of the front surface of the component B when viewed in the left-right direction.
  • the parts A and B when viewed in the left-right direction, are arranged so that one straight line parallel to the front-rear direction passes through.
  • the part A and the part B may or may not be arranged so that one straight line parallel to the front-rear direction passes through.
  • This definition also applies to directions other than the front-rear direction. This definition applies not only to parts but also to parts of parts, straight lines and planes.
  • the component A when the component A is arranged between the component B and the component C when viewed in the left-right direction, it indicates the following state.
  • the line segment arranged at the uppermost position among the line segments connecting the points on the contour of the part B and the points on the contour of the part C when viewed in the left-right direction is defined as a line segment LU.
  • the line segment arranged at the lowest position among the line segments connecting the points on the contour of the part B and the points on the contour of the part C when viewed in the left-right direction is defined as a line segment LD.
  • the state is a state where the component A does not overlap the component B and the component C in a rectangular area having two sides of the line segment LU and the line segment LD when viewed in the left-right direction.
  • the line segment arranged on the leftmost side among the line segments connecting the point on the contour of the part B and the point on the contour of the part C when viewed in the left-right direction is defined as a line segment LL.
  • the line segment LR is the line segment arranged on the rightmost side among the line segments connecting the point on the contour of the component B and the point on the contour of the component C when viewed in the left-right direction.
  • the state is a state in which the component A does not overlap the component B and the component C in the rectangular area having the line segment LL and the line segment LR as two sides when viewed in the left-right direction.
  • This definition can also be applied when viewed from a direction other than the left-right direction. This definition applies not only to parts but also to parts of parts, straight lines and planes.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Engineering & Computer Science (AREA)
  • Toxicology (AREA)
  • Health & Medical Sciences (AREA)
  • Materials Engineering (AREA)
  • Transportation (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Supercharger (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
PCT/JP2015/085570 2014-12-19 2015-12-18 鞍乗型車両 WO2016098900A1 (ja)

Priority Applications (8)

Application Number Priority Date Filing Date Title
EP15870099.7A EP3235714B1 (en) 2014-12-19 2015-12-18 Saddle-ride vehicle
TW104143046A TWI577600B (zh) 2014-12-19 2015-12-21 Straddle type vehicle
TW104143042A TWI612213B (zh) 2014-12-19 2015-12-21 跨坐型車輛
TW104143043A TWI576506B (zh) 2014-12-19 2015-12-21 Straddle type vehicle
TW104143044A TWI637106B (zh) 2014-12-19 2015-12-21 Straddle type vehicle
TW104143040A TWI577883B (zh) 2014-12-19 2015-12-21 Straddle type vehicle
TW104143041A TWI644018B (zh) 2014-12-19 2015-12-21 Straddle type vehicle
TW104143039A TWI573930B (zh) 2014-12-19 2015-12-21 Straddle type vehicle

Applications Claiming Priority (10)

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JP2014256984 2014-12-19
JP2014-256985 2014-12-19
JP2014-256984 2014-12-19
JP2014256983 2014-12-19
JP2014-256983 2014-12-19
JP2014256985 2014-12-19
JP2015077744 2015-04-06
JP2015-077744 2015-04-06
JP2015-157520 2015-08-07
JP2015157520 2015-08-07

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PCT/JP2015/085576 WO2016098901A1 (ja) 2014-12-19 2015-12-18 鞍乗型車両
PCT/JP2015/085589 WO2016098903A1 (ja) 2014-12-19 2015-12-18 鞍乗型車両
PCT/JP2015/085593 WO2016098906A1 (ja) 2014-12-19 2015-12-18 鞍乗型車両
PCT/JP2015/085584 WO2016098902A1 (ja) 2014-12-19 2015-12-18 鞍乗型車両
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PCT/JP2015/085589 WO2016098903A1 (ja) 2014-12-19 2015-12-18 鞍乗型車両
PCT/JP2015/085593 WO2016098906A1 (ja) 2014-12-19 2015-12-18 鞍乗型車両
PCT/JP2015/085584 WO2016098902A1 (ja) 2014-12-19 2015-12-18 鞍乗型車両
PCT/JP2015/085551 WO2016098896A1 (ja) 2014-12-19 2015-12-18 鞍乗型車両

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